/**
 * Exact Time (Точное Время) - Master Design System & Stylesheet
 * High-end Glassmorphism, Dynamic Color Themes & Atomic Micro-Interactions
 */

/* ==========================================================================
   CSS Custom Properties & Themes
   ========================================================================== */
:root {
    /* Theme: Obsidian Cyber (Default Dark) */
    --bg-gradient: radial-gradient(circle at 50% 20%, #151c28 0%, #0a0d14 100%);
    --bg-color: #0a0d14;
    --card-bg: rgba(21, 28, 40, 0.7);
    --card-bg-hover: rgba(28, 38, 54, 0.85);
    --card-backdrop: blur(16px);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-active: rgba(12, 123, 137, 0.45);
    
    --text-primary: #f0f4f8;
    --text-secondary: #8c9bb0;
    --text-muted: #566479;
    
    --accent-color: #14a3b6;
    --accent-base: #0C7B89;
    --accent-secondary: #0C7B89;
    --accent-glow: rgba(12, 123, 137, 0.55);
    --accent-glow-strong: rgba(20, 163, 182, 0.8);
    --accent-glow-wide: rgba(12, 123, 137, 0.4);
    --success-color: #00ff88;
    --success-glow: rgba(0, 255, 136, 0.4);
    --warning-color: #ffb800;
    --danger-color: #ff3366;

    /* Clock dials */
    --clock-bg-inner: #151d2a;
    --clock-bg-outer: #0a0e16;
    --clock-ring-color: rgba(12, 123, 137, 0.2);
    --clock-bezel-border: rgba(255, 255, 255, 0.05);
    --clock-num-color: #e2e8f0;
    --clock-tick-color: rgba(255, 255, 255, 0.3);
    --clock-tick-major: #14a3b6;
    --clock-hour-hand: #f0f4f8;
    --clock-min-hand: #cbd5e1;
    --clock-sec-hand: #14a3b6;
    --clock-sec-glow: rgba(12, 123, 137, 0.7);
    --clock-pin-outer: #0a0e16;
    --clock-pin-border: #14a3b6;
    --clock-brand-color: #ffffff;

    --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-full: 9999px;
    --transition-fast: 0.35s cubic-bezier(0.2, 0.8, 0.25, 1);
    --transition-norm: 0.55s cubic-bezier(0.2, 0.9, 0.3, 1);
    --transition-slow: 0.85s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-phlegm: 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Theme: Titanium Platinum (Monochrome Stealth Luxury) */
[data-theme="platinum"] {
    --bg-gradient: radial-gradient(circle at 50% 15%, #181d28 0%, #07090d 100%);
    --bg-color: #07090d;
    --card-bg: rgba(22, 27, 38, 0.7);
    --card-bg-hover: rgba(32, 40, 56, 0.85);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-active: rgba(226, 232, 240, 0.45);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-color: #cbd5e1;
    --accent-base: #94a3b8;
    --accent-secondary: #475569;
    --accent-glow: rgba(226, 232, 240, 0.4);
    --accent-glow-strong: rgba(248, 250, 252, 0.7);
    --accent-glow-wide: rgba(148, 163, 184, 0.25);
    --clock-bg-inner: #151a24;
    --clock-bg-outer: #080a0e;
    --clock-ring-color: rgba(226, 232, 240, 0.15);
    --clock-tick-color: rgba(255, 255, 255, 0.25);
    --clock-tick-major: #e2e8f0;
    --clock-sec-hand: #f8fafc;
    --clock-sec-glow: rgba(226, 232, 240, 0.7);
    --clock-pin-border: #e2e8f0;
}

/* Theme: Royal Emerald (Deep Velvet Jade) */
[data-theme="emerald"] {
    --bg-gradient: radial-gradient(circle at 50% 15%, #0b221c 0%, #030d0a 100%);
    --bg-color: #030d0a;
    --card-bg: rgba(11, 34, 28, 0.7);
    --card-bg-hover: rgba(16, 48, 39, 0.85);
    --border-glass: rgba(16, 185, 129, 0.1);
    --border-glass-active: rgba(16, 185, 129, 0.45);
    --text-primary: #ecfdf5;
    --text-secondary: #86efac;
    --text-muted: #4b7c6f;
    --accent-color: #10b981;
    --accent-base: #059669;
    --accent-secondary: #044e3b;
    --accent-glow: rgba(16, 185, 129, 0.45);
    --accent-glow-strong: rgba(52, 211, 153, 0.75);
    --accent-glow-wide: rgba(16, 185, 129, 0.3);
    --clock-bg-inner: #0b221a;
    --clock-bg-outer: #030c08;
    --clock-ring-color: rgba(16, 185, 129, 0.2);
    --clock-tick-color: rgba(16, 185, 129, 0.35);
    --clock-tick-major: #10b981;
    --clock-sec-hand: #34d399;
    --clock-sec-glow: rgba(16, 185, 129, 0.75);
    --clock-pin-border: #10b981;
}

/* Theme: Solar Amber Gold */
[data-theme="solar"] {
    --bg-gradient: radial-gradient(circle at 50% 10%, #291a0c 0%, #0d0803 100%);
    --bg-color: #0d0803;
    --card-bg: rgba(38, 24, 12, 0.65);
    --card-bg-hover: rgba(56, 36, 18, 0.8);
    --border-glass: rgba(255, 170, 0, 0.15);
    --border-glass-active: rgba(255, 170, 0, 0.5);
    --accent-color: #ffaa00;
    --accent-glow: rgba(255, 170, 0, 0.6);
    --accent-glow-strong: rgba(255, 170, 0, 0.85);
    --accent-glow-wide: rgba(255, 170, 0, 0.45);
    --accent-secondary: #ff5500;
    --clock-bg-inner: #2d1e0f;
    --clock-bg-outer: #120b04;
    --clock-ring-color: rgba(255, 170, 0, 0.25);
    --clock-tick-color: rgba(255, 170, 0, 0.35);
    --clock-tick-major: #ffaa00;
    --clock-sec-hand: #ffaa00;
    --clock-sec-glow: rgba(255, 170, 0, 0.9);
    --clock-pin-border: #ffaa00;
}

/* Theme: Clean Minimalist Light */
[data-theme="light"] {
    --bg-gradient: radial-gradient(circle at 50% 10%, #f8fafc 0%, #e2e8f0 100%);
    --bg-color: #f1f5f9;
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-bg-hover: rgba(255, 255, 255, 0.95);
    --border-glass: rgba(0, 0, 0, 0.08);
    --border-glass-active: rgba(14, 165, 233, 0.5);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent-color: #0284c7;
    --accent-glow: rgba(2, 132, 199, 0.4);
    --accent-glow-strong: rgba(2, 132, 199, 0.6);
    --accent-glow-wide: rgba(2, 132, 199, 0.25);
    --clock-bg-inner: #ffffff;
    --clock-bg-outer: #f1f5f9;
    --clock-ring-color: rgba(2, 132, 199, 0.2);
    --clock-bezel-border: rgba(0, 0, 0, 0.06);
    --clock-num-color: #0f172a;
    --clock-tick-color: rgba(0, 0, 0, 0.2);
    --clock-tick-major: #0284c7;
    --clock-hour-hand: #0f172a;
    --clock-min-hand: #334155;
    --clock-sec-hand: #e11d48;
    --clock-sec-glow: rgba(225, 29, 72, 0.4);
    --clock-pin-outer: #0f172a;
    --clock-pin-border: #e11d48;
    --clock-brand-color: #475569;
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    background: var(--bg-color);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    transition: background var(--transition-slow), color var(--transition-slow);
}

/* Ambient Background Grid */
.bg-mesh {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.25;
    background-size: 40px 40px;
    background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
}

.app-wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1300px;
    margin: 0 auto;
    padding: 20px 24px 40px;
}

/* ==========================================================================
   Header & Controls Navigation
   ========================================================================== */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-glass);
    gap: 16px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-fast);
}

.brand-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 20px var(--accent-glow);
    color: #fff;
    font-size: 1.25rem;
    transition: all var(--transition-fast);
}

.brand:hover .brand-icon {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--accent-glow-strong);
}

.brand-info h1 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
    transition: all var(--transition-fast);
}

.brand:hover .brand-info h1 {
    color: var(--accent-color);
    text-shadow: 0 0 14px var(--accent-glow);
}

.brand-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* ==========================================================================
   Language Switcher
   ========================================================================== */
.lang-switcher {
    position: relative;
    display: inline-block;
    z-index: 150;
}

.lang-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    padding: 7px 12px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: var(--card-backdrop);
    user-select: none;
    height: 38px;
    box-sizing: border-box;
}

.lang-btn:hover,
.lang-switcher.open .lang-btn {
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 15px var(--accent-glow);
    color: var(--accent-color);
}

.lang-btn .lang-icon {
    font-size: 1rem;
}

.lang-btn .lang-arrow {
    font-size: 0.65rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.lang-switcher.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 290px;
    max-width: 90vw;
    background: var(--bg-color);
    border: 1px solid var(--border-glass-active);
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.65), 0 0 20px var(--accent-glow);
    padding: 12px;
    display: none;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
    backdrop-filter: blur(24px);
    animation: fadeInDown 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-8px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.lang-dropdown.show {
    display: flex;
}

.lang-dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: 0 4px;
}

.lang-search-wrap input {
    width: 100%;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
    box-sizing: border-box;
    transition: border-color var(--transition-fast);
}

.lang-search-wrap input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

.lang-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3px;
    max-height: 280px;
    overflow-y: auto;
    padding-right: 4px;
}

.lang-grid::-webkit-scrollbar {
    width: 5px;
}
.lang-grid::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 4px;
}
.lang-grid::-webkit-scrollbar-thumb {
    background: var(--accent-base);
    border-radius: 4px;
}

.lang-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.lang-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.lang-item.active {
    background: var(--accent-glow);
    color: var(--accent-color);
    font-weight: 700;
    border: 1px solid var(--border-glass-active);
}

.lang-code-pill {
    padding: 2px 6px;
    font-size: 0.72rem;
    font-family: var(--font-mono);
    font-weight: 700;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.lang-item.active .lang-code-pill {
    background: var(--accent-color);
    color: #050811;
}

.lang-name-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lang-check {
    color: var(--accent-color);
    font-weight: 700;
}

/* Clock Mode Switcher Pill */
.clock-mode-toggle {
    display: inline-flex;
    align-items: center;
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 3px;
    gap: 3px;
    backdrop-filter: var(--card-backdrop);
    transition: all var(--transition-norm);
}

.clock-mode-toggle:hover {
    border-color: var(--border-glass-active);
}

.clock-mode-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px;
    border: 2px solid transparent;
    border-radius: calc(var(--radius-md) - 3px);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-phlegm);
    white-space: nowrap;
    line-height: 1;
}

.clock-mode-btn:hover {
    color: var(--text-primary);
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 12px var(--accent-glow);
    transform: translateY(-2px);
}

.clock-mode-btn.active {
    background: linear-gradient(135deg, #3d6a70 0%, #365c61 50%, #2e4f54 100%);
    color: #ffffff;
    border: 2px solid #0d8291;
    box-shadow: 0 2px 12px rgba(13, 130, 145, 0.4);
}

.clock-mode-btn.active:hover {
    background: linear-gradient(135deg, #44757c 0%, #3c656b 50%, #34575c 100%);
    border-color: #129db0;
    transform: translateY(-2px);
    box-shadow: 0 4px 18px rgba(13, 130, 145, 0.55);
}

.clock-mode-btn .mode-icon {
    font-size: 0.95rem;
}

@media (max-width: 640px) {
    .clock-mode-btn .mode-label {
        display: none;
    }
    .clock-mode-btn {
        padding: 4px 7px;
    }
}

/* Floating Action Buttons */
.btn-icon {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: var(--card-backdrop);
    transition: all var(--transition-phlegm);
    font-size: 1rem;
}

.btn-icon:hover {
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-icon.active {
    background: linear-gradient(135deg, #3d6a70 0%, #365c61 50%, #2e4f54 100%);
    color: #ffffff;
    border: 2px solid #0d8291;
    box-shadow: 0 0 15px rgba(13, 130, 145, 0.5);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 8px;
    margin: 24px 0;
    padding: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--card-backdrop);
    overflow-x: auto;
    scrollbar-width: none;
}
.nav-tabs::-webkit-scrollbar { display: none; }

.tab-btn {
    flex: 1;
    min-width: fit-content;
    padding: 9px 17px;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--transition-phlegm);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 16px var(--accent-glow);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: linear-gradient(135deg, #3d6a70 0%, #365c61 50%, #2e4f54 100%);
    color: #ffffff;
    border: 2px solid #0d8291;
    box-shadow: 0 4px 16px rgba(13, 130, 145, 0.45);
}

.tab-btn.active:hover {
    background: linear-gradient(135deg, #44757c 0%, #3c656b 50%, #34575c 100%);
    border-color: #129db0;
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(13, 130, 145, 0.6);
}

/* ==========================================================================
   Hero Atomic Display Section
   ========================================================================== */
.hero-clock-section {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 40px 24px;
    text-align: center;
    backdrop-filter: var(--card-backdrop);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    margin-bottom: 24px;
    overflow: hidden;
}

.hero-clock-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, var(--accent-glow-wide) 0%, transparent 60%);
    opacity: 0.35;
    pointer-events: none;
}

/* Atomic Status Pill */
.sync-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 16px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: -16px;
    margin-bottom: 14px;
}

.pulse-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--success-color);
    box-shadow: 0 0 10px var(--success-glow);
    position: relative;
}

.pulse-dot.syncing {
    background: var(--warning-color);
    box-shadow: 0 0 10px rgba(255, 184, 0, 0.6);
    animation: pulseAnim 1s infinite alternate;
}

.pulse-dot.error {
    background: var(--danger-color);
    box-shadow: 0 0 10px rgba(255, 51, 102, 0.6);
}

@keyframes pulseAnim {
    0% { transform: scale(0.8); opacity: 0.5; }
    100% { transform: scale(1.3); opacity: 1; }
}

/* Big Digital Time Display */
.digital-display {
    position: relative;
    display: flex;
    align-items: baseline;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: -2px;
    user-select: all;
    line-height: 1;
    margin: 0 0 16px;
    z-index: 1;
    animation: phlegmaticFadeSlide 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

.digital-display::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 75%;
    height: 140%;
    background: radial-gradient(ellipse at center, var(--accent-glow-wide) 0%, rgba(12, 123, 137, 0.15) 50%, transparent 75%);
    filter: blur(28px);
    pointer-events: none;
    z-index: -1;
    opacity: 0.7;
}

.time-main {
    font-size: clamp(3rem, 11vw, 7.5rem);
    color: var(--text-primary);
    text-shadow: 
        0 0 14px var(--accent-glow-strong),
        0 0 32px var(--accent-glow),
        0 0 65px var(--accent-glow-wide),
        0 0 95px rgba(12, 123, 137, 0.35);
}

.time-millis {
    font-size: clamp(1.4rem, 4vw, 2.8rem);
    color: var(--accent-color);
    margin-left: 8px;
    opacity: 0.95;
    font-weight: 600;
    text-shadow: 
        0 0 12px var(--accent-glow-strong),
        0 0 28px var(--accent-glow);
}

.time-ampm {
    font-size: clamp(1rem, 2.5vw, 1.8rem);
    color: var(--text-secondary);
    margin-left: 12px;
    font-weight: 600;
}

/* Analog Clock View Container in Hero */
.analog-display-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 10px 0 20px;
    animation: phlegmaticFadeSlide 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

.analog-display-wrapper .analog-clock-container {
    padding: 0;
}

/* Date and Timezone Row */
.date-full {
    font-size: clamp(1.1rem, 2.5vw, 1.6rem);
    font-weight: 500;
    color: var(--text-primary);
    margin: 12px 0 22px;
}

.timezone-info {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin: 0 0 46px;
}

.timezone-tag {
    padding: 7px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
    font-size: 0.92rem;
    letter-spacing: 0.2px;
}

/* Quick Control Toggles */
.display-toggles {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    margin-top: 38px;
    flex-wrap: wrap;
}

.toggle-chip {
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-phlegm);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
}

.toggle-chip:hover {
    color: var(--text-primary);
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

.toggle-chip.active {
    background: rgba(12, 123, 137, 0.2);
    color: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

.toggle-chip.active:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 18px var(--accent-glow-strong);
}

/* Discrepancy Alert Ribbon */
.discrepancy-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: rgba(12, 123, 137, 0.08);
    border: 1px solid var(--border-glass-active);
    border-radius: var(--radius-md);
    margin-top: 24px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    gap: 16px;
    flex-wrap: wrap;
}

.discrepancy-val {
    font-weight: 700;
    color: var(--accent-color);
}

/* ==========================================================================
   Grid & Section Cards
   ========================================================================== */
.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: phlegmaticFadeSlide 0.65s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes phlegmaticFadeSlide {
    0% {
        opacity: 0;
        transform: translateY(14px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.app-card {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 24px;
    backdrop-filter: var(--card-backdrop);
    transition: all var(--transition-phlegm);
}

.app-card:hover {
    border-color: var(--border-glass-active);
    box-shadow: 0 14px 35px rgba(0, 0, 0, 0.25), 0 0 18px var(--accent-glow);
    transform: translateY(-2px);
}

.card-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-title-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-icon {
    color: var(--accent-color);
}

/* Stat Rows inside cards */
.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
}
.stat-row:last-child { border-bottom: none; }

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
}

.stat-value.highlight {
    color: var(--accent-color);
}

/* Progress bar inside stats */
.progress-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 12px 0 6px;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--success-color));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

/* ==========================================================================
   World Clock: Hero Search, Time Converter & Interactive Grid
   ========================================================================== */
.world-hero-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 28px 32px;
    margin-bottom: 24px;
    text-align: left;
}

.world-hero-search-area {
    display: flex;
    flex-direction: column;
    gap: 14px;
    width: 100%;
}

.world-search-wrap {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.world-search-icon {
    position: absolute;
    left: 18px;
    font-size: 1.2rem;
    color: var(--accent-color);
    pointer-events: none;
    filter: drop-shadow(0 0 6px var(--accent-glow));
    z-index: 2;
}

.world-search-hero-input {
    width: 100%;
    padding: 15px 48px 15px 50px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass-active);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1.05rem;
    font-weight: 500;
    outline: none;
    transition: all var(--transition-fast);
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.25);
    box-sizing: border-box;
}

.world-search-hero-input:focus {
    background: rgba(255, 255, 255, 0.07);
    border-color: var(--accent-color);
    box-shadow: 0 0 20px var(--accent-glow), inset 0 2px 6px rgba(0, 0, 0, 0.2);
}

.world-search-hero-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.btn-clear-search {
    position: absolute;
    right: 14px;
    width: 28px;
    height: 28px;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 2;
}

.btn-clear-search:hover {
    background: var(--danger-color);
    color: #ffffff;
    border-color: var(--danger-color);
    box-shadow: 0 0 10px rgba(255, 51, 102, 0.5);
    transform: scale(1.1);
}

/* Quick Filter Suggestion Pills */
.quick-city-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.quick-tags-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: none;
    margin-right: 4px;
}

.city-tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 6px 13px;
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 5px;
    user-select: none;
}

.city-tag:hover {
    background: var(--card-bg-hover);
    border-color: var(--accent-color);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px var(--accent-glow);
}

.city-tag.active {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    color: #ffffff;
    border-color: var(--accent-color);
    box-shadow: 0 0 16px var(--accent-glow-strong);
    transform: translateY(-2px);
    font-weight: 600;
}

/* Timezone Comparison Slider Inside Hero */
.time-slider-box.inside-hero {
    margin-top: 4px;
    background: rgba(255, 255, 255, 0.025);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 20px 22px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 10px;
}

.slider-title-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-icon {
    font-size: 1.15rem;
    filter: drop-shadow(0 0 6px var(--accent-glow));
}

.slider-title-text {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.slider-time-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-time-badge {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass-active);
    color: var(--accent-color);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.88rem;
    letter-spacing: 0.5px;
}

.reset-chip {
    font-size: 0.78rem;
    padding: 4px 10px;
}

.slider-track-wrap {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.time-range-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    transition: background 0.2s;
}

.time-range-slider:hover {
    background: rgba(255, 255, 255, 0.15);
}

.time-range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent-color);
    box-shadow: 0 0 16px var(--accent-glow-strong);
    cursor: grab;
    transition: transform 0.15s, box-shadow 0.15s;
    border: 2px solid #ffffff;
}

.time-range-slider::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.2);
    box-shadow: 0 0 24px var(--accent-glow-strong);
}

.slider-marks {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.74rem;
    color: var(--text-muted);
    padding: 0 4px;
}

.mark-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.mark-dot {
    font-size: 0.85rem;
}

/* World Grid Header & Badges */
.world-grid-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0 16px;
    padding: 0 4px;
}

.world-grid-title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
}

.world-grid-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.world-grid-badge {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

/* World Grid & City Cards */
.world-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.world-card {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    position: relative;
    transition: all var(--transition-norm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 140px;
    box-sizing: border-box;
}

.world-card:hover {
    border-color: var(--border-glass-active);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35), 0 0 16px var(--accent-glow);
}

.world-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
    gap: 8px;
}

.world-card-city {
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.world-card-sub {
    font-size: 0.76rem;
    color: var(--text-secondary);
    margin-top: 2px;
    line-height: 1.3;
}

.world-card-day-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    flex-shrink: 0;
}

.world-card-day-badge.day {
    color: #ffd166;
    border-color: rgba(255, 209, 102, 0.3);
    background: rgba(255, 209, 102, 0.08);
}

.world-card-day-badge.night {
    color: #a0c4ff;
    border-color: rgba(160, 196, 255, 0.3);
    background: rgba(160, 196, 255, 0.08);
}

.world-card-time {
    font-family: var(--font-mono);
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1.2;
    margin: 4px 0 10px;
    letter-spacing: -0.5px;
    text-shadow: 0 0 14px var(--accent-glow);
}

.world-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 10px;
    border-top: 1px solid var(--border-glass);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.time-diff-pill {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-glass);
}

/* ==========================================================================
   Stopwatch & Countdown Timer
   ========================================================================== */
.stopwatch-display, .timer-display {
    text-align: center;
    padding: 30px 0;
}

.big-counter {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    color: var(--text-primary);
    text-shadow: 
        0 0 14px var(--accent-glow-strong),
        0 0 32px var(--accent-glow),
        0 0 60px var(--accent-glow-wide);
}

.controls-row {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.btn-action {
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-phlegm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    color: #ffffff;
    box-shadow: 0 4px 18px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

/* Lap List */
.laps-container {
    max-height: 240px;
    overflow-y: auto;
    margin-top: 24px;
    border-top: 1px solid var(--border-glass);
    padding-top: 12px;
}

.lap-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
}

.lap-item:nth-child(odd) {
    background: rgba(255, 255, 255, 0.02);
}

/* Timer Ring */
.timer-ring-container {
    position: relative;
    width: 220px;
    height: 220px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timer-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-circle-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.08);
    stroke-width: 8;
}

.timer-circle-progress {
    fill: none;
    stroke: var(--accent-color);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 628;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.1s linear;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.timer-inner-text {
    font-family: var(--font-mono);
    font-size: 2.2rem;
    font-weight: 700;
}

/* Timer Manual Input */
.timer-manual-inputs {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 16px auto 0;
    padding: 10px 18px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    transition: all var(--transition-phlegm);
}

.timer-manual-inputs.timer-running {
    opacity: 0.45;
    pointer-events: none;
}

.timer-input-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.timer-input-box {
    width: 62px;
    height: 48px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1.55rem;
    font-weight: 700;
    text-align: center;
    outline: none;
    transition: all var(--transition-phlegm);
    -moz-appearance: textfield;
}

.timer-input-box::-webkit-inner-spin-button,
.timer-input-box::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.timer-input-box:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 14px var(--accent-glow);
    background: rgba(0, 0, 0, 0.55);
}

.timer-unit-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    font-weight: 600;
}

.timer-input-colon {
    font-family: var(--font-mono);
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 20px;
    user-select: none;
}

/* ==========================================================================
   NTP Diagnostics Panel
   ========================================================================== */
.diagnostics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.diag-stat-card {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 16px;
}

.diag-stat-title {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.diag-stat-number {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-color);
}

.sync-history-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 12px;
}

.sync-history-table th, .sync-history-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-glass);
}

.sync-history-table th {
    color: var(--text-secondary);
    font-weight: 600;
}

/* ==========================================================================
   Modal Dialogs & Sound Settings
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.open {
    display: flex;
}

.modal-content {
    background: var(--bg-color);
    border: 1px solid var(--border-glass-active);
    border-radius: var(--radius-lg);
    max-width: 520px;
    width: 100%;
    padding: 28px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
    animation: modalIn 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.93) translateY(12px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.modal-close {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    padding: 2px 8px;
    line-height: 1;
    transition: all var(--transition-phlegm);
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

/* ==========================================================================
   Zen / Fullscreen Mode
   ========================================================================== */
body.zen-mode .app-header,
body.zen-mode .nav-tabs,
body.zen-mode .content-section:not(#section-main),
body.zen-mode .app-footer {
    display: none !important;
}

body.zen-mode .content-section#section-main {
    display: block !important;
    padding: 0;
    margin: 0;
    width: 100%;
}

body.zen-mode #section-main .cards-grid {
    display: none !important;
}

body.zen-mode .app-wrapper {
    height: 100vh;
    justify-content: center;
    padding: 0;
}

body.zen-mode .hero-clock-section {
    border: none;
    background: transparent;
    box-shadow: none;
    padding: 0;
}

body.zen-mode .digital-display .time-main {
    font-size: clamp(4rem, 18vw, 15rem);
}

body.zen-mode .analog-display-wrapper {
    margin: 0;
}

body.zen-mode .analog-clock {
    width: clamp(280px, 45vmin, 480px);
    height: clamp(280px, 45vmin, 480px);
}

.zen-exit-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    display: none;
    z-index: 100;
}

.zen-exit-btn:hover {
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-2px);
}

body.zen-mode .zen-exit-btn {
    display: flex;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.app-footer {
    margin-top: auto;
    padding-top: 30px;
    border-top: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
    gap: 12px;
}

.footer-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
    background: var(--card-bg);
    backdrop-filter: var(--card-backdrop);
    font-weight: 500;
    font-size: 0.85rem;
    transition: all var(--transition-phlegm);
    display: inline-flex;
    align-items: center;
}

.footer-links a:hover {
    color: var(--accent-color);
    background: var(--card-bg-hover);
    border-color: var(--border-glass-active);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: var(--card-bg-hover);
    border: 1px solid var(--border-glass-active);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: toastIn 0.3s ease;
    backdrop-filter: var(--card-backdrop);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Mobile & Responsive Optimization
   ========================================================================== */
@media (max-width: 768px) {
    .app-wrapper {
        padding: 14px 16px 32px;
    }

    .app-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 14px;
        padding-bottom: 18px;
    }

    .brand {
        justify-content: center;
    }

    .header-actions {
        justify-content: center;
        width: 100%;
        gap: 8px;
    }

    .hero-clock-section {
        padding: 28px 16px;
        margin-bottom: 20px;
    }

    .cards-grid,
    .world-grid,
    .diagnostics-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .app-footer {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 16px;
        padding-top: 24px;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .app-wrapper {
        padding: 10px 12px 24px;
    }

    .brand-icon {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .brand-info h1 {
        font-size: 1.02rem;
    }

    .brand-info p {
        font-size: 0.7rem;
    }

    .header-actions {
        gap: 6px;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .lang-btn {
        height: 36px;
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .clock-mode-toggle {
        padding: 2px;
        gap: 2px;
    }

    .clock-mode-btn {
        padding: 4px 7px;
        font-size: 0.75rem;
    }

    .nav-tabs {
        margin: 14px 0;
        padding: 4px;
        gap: 4px;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        padding: 7px 11px;
        font-size: 0.82rem;
        gap: 5px;
    }

    .hero-clock-section {
        padding: 20px 12px;
        border-radius: var(--radius-md);
    }

    .sync-status-badge {
        font-size: 0.75rem;
        padding: 4px 12px;
        margin-top: -8px;
        margin-bottom: 8px;
    }

    .timezone-info {
        gap: 6px;
        margin-bottom: 30px;
    }

    .timezone-tag {
        padding: 5px 10px;
        font-size: 0.8rem;
    }

    .digital-display .time-main {
        font-size: clamp(2.3rem, 12.5vw, 4.5rem);
        letter-spacing: -1px;
    }

    .digital-display .time-millis {
        font-size: clamp(1rem, 4.5vw, 1.8rem);
        margin-left: 4px;
    }

    .date-full {
        font-size: 1.05rem;
        margin: 10px 0 16px;
    }

    .display-toggles {
        gap: 8px;
        margin-top: 24px;
    }

    .toggle-chip {
        padding: 6px 12px;
        font-size: 0.8rem;
        gap: 5px;
    }

    .discrepancy-card {
        padding: 10px 12px;
        font-size: 0.78rem;
        margin-top: 16px;
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }

    .app-card {
        padding: 16px 14px;
    }

    .world-clock-controls {
        flex-direction: column;
    }

    .search-input {
        width: 100%;
        min-width: unset;
        padding: 10px 14px;
        font-size: 0.88rem;
    }

    .time-slider-box {
        padding: 16px 12px;
    }

    .stopwatch-display, .timer-display {
        padding: 16px 0;
    }

    .big-counter {
        font-size: clamp(2.2rem, 11vw, 3.5rem);
    }

    .timer-ring-container {
        width: 180px;
        height: 180px;
    }

    .timer-inner-text {
        font-size: 1.7rem;
    }

    .btn-action {
        padding: 10px 20px;
        font-size: 0.88rem;
    }

    .modal-content {
        padding: 20px 16px;
        border-radius: var(--radius-md);
    }

    .toast-container {
        bottom: 16px;
        right: 16px;
        left: 16px;
    }

    .toast {
        padding: 10px 14px;
        font-size: 0.85rem;
    }
}

@media (max-width: 360px) {
    .brand-info h1 {
        font-size: 0.92rem;
    }

    .digital-display .time-main {
        font-size: clamp(2rem, 11.5vw, 3.8rem);
    }

    .toggle-chip {
        padding: 5px 9px;
        font-size: 0.76rem;
    }
}

/* ==========================================================================
   404 & Maintenance Error Pages
   ========================================================================== */
.content-404 h1 {
    font-size: clamp(3rem, 8vw, 4.5rem);
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--accent-color);
    text-shadow: 0 0 30px var(--accent-glow);
    margin-bottom: 12px;
    letter-spacing: -2px;
    line-height: 1.1;
}

.content-404 h2,
.content-404 h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-family: var(--font-sans);
}

.content-404 p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 8px;
}

.maintain-page-content h1,
.maintain-page-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-family: var(--font-sans);
}

.maintain-page-content p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.6;
}