/* ==========================================================================
   Design System & Theme Tokens
   ========================================================================== */
:root {
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition-speed: 0.3s;
}

/* Theme 1: Dark Luxury (Default) */
[data-theme="dark"] {
    --bg-gradient: radial-gradient(circle at 50% 30%, #1e293b 0%, #0f172a 100%);
    --card-bg: rgba(30, 41, 59, 0.5);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --clock-bg: radial-gradient(circle, #1e293b 0%, #0f172a 100%);
    --clock-shadow: 12px 12px 35px rgba(0, 0, 0, 0.5), -8px -8px 25px rgba(255, 255, 255, 0.03);
    --clock-inner-shadow: inset 5px 5px 15px rgba(0, 0, 0, 0.6), inset -5px -5px 15px rgba(255, 255, 255, 0.04);
    --tick-major: #94a3b8;
    --tick-minor: #475569;
    --num-color: #cbd5e1;
    --hand-hr: #f8fafc;
    --hand-min: #38bdf8;
    --hand-sec: #f43f5e;
    --sec-glow: rgba(244, 63, 94, 0.4);
    --cap-bg: #f8fafc;
    --cap-border: #f43f5e;
    --badge-bg: rgba(56, 189, 248, 0.15);
    --badge-text: #38bdf8;
    --control-bg: rgba(15, 23, 42, 0.6);
}

/* Theme 2: Nordic Light */
[data-theme="light"] {
    --bg-gradient: radial-gradient(circle at 50% 30%, #f1f5f9 0%, #e2e8f0 100%);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(0, 0, 0, 0.08);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --clock-bg: radial-gradient(circle, #ffffff 0%, #f8fafc 100%);
    --clock-shadow: 12px 12px 30px rgba(0, 0, 0, 0.08), -8px -8px 20px rgba(255, 255, 255, 0.9);
    --clock-inner-shadow: inset 4px 4px 10px rgba(0, 0, 0, 0.05), inset -4px -4px 10px rgba(255, 255, 255, 0.8);
    --tick-major: #334155;
    --tick-minor: #cbd5e1;
    --num-color: #1e293b;
    --hand-hr: #0f172a;
    --hand-min: #0284c7;
    --hand-sec: #e11d48;
    --sec-glow: rgba(225, 29, 72, 0.25);
    --cap-bg: #0f172a;
    --cap-border: #e11d48;
    --badge-bg: rgba(2, 132, 199, 0.12);
    --badge-text: #0284c7;
    --control-bg: rgba(255, 255, 255, 0.8);
}

/* Theme 3: Cyber Neon */
[data-theme="cyber"] {
    --bg-gradient: radial-gradient(circle at 50% 30%, #0d0e1b 0%, #05050a 100%);
    --card-bg: rgba(15, 15, 26, 0.8);
    --card-border: rgba(0, 255, 204, 0.2);
    --text-primary: #00ffcc;
    --text-secondary: #ff007f;
    --clock-bg: radial-gradient(circle, #0f0f1c 0%, #070710 100%);
    --clock-shadow: 0 0 30px rgba(0, 255, 204, 0.15), 12px 12px 35px rgba(0, 0, 0, 0.9);
    --clock-inner-shadow: inset 0 0 20px rgba(0, 255, 204, 0.1), inset 5px 5px 15px rgba(0, 0, 0, 0.8);
    --tick-major: #00ffcc;
    --tick-minor: rgba(0, 255, 204, 0.3);
    --num-color: #00ffcc;
    --hand-hr: #ffffff;
    --hand-min: #00ffcc;
    --hand-sec: #ff007f;
    --sec-glow: rgba(255, 0, 127, 0.8);
    --cap-bg: #ff007f;
    --cap-border: #00ffcc;
    --badge-bg: rgba(255, 0, 127, 0.2);
    --badge-text: #ff007f;
    --control-bg: rgba(15, 15, 26, 0.9);
}

/* Theme 4: Emerald Gold */
[data-theme="emerald"] {
    --bg-gradient: radial-gradient(circle at 50% 30%, #064e3b 0%, #022c22 100%);
    --card-bg: rgba(6, 78, 59, 0.4);
    --card-border: rgba(245, 158, 11, 0.25);
    --text-primary: #fef3c7;
    --text-secondary: #6ee7b7;
    --clock-bg: radial-gradient(circle, #064e3b 0%, #022c22 100%);
    --clock-shadow: 12px 12px 35px rgba(0, 0, 0, 0.6), 0 0 25px rgba(245, 158, 11, 0.1);
    --clock-inner-shadow: inset 5px 5px 15px rgba(0, 0, 0, 0.7), inset -3px -3px 10px rgba(245, 158, 11, 0.15);
    --tick-major: #f59e0b;
    --tick-minor: #047857;
    --num-color: #fde68a;
    --hand-hr: #fef3c7;
    --hand-min: #f59e0b;
    --hand-sec: #10b981;
    --sec-glow: rgba(16, 185, 129, 0.5);
    --cap-bg: #f59e0b;
    --cap-border: #10b981;
    --badge-bg: rgba(245, 158, 11, 0.2);
    --badge-text: #f59e0b;
    --control-bg: rgba(2, 44, 34, 0.8);
}

/* ==========================================================================
   Global Reset & Base Layout
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
    transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.app-container {
    width: 100%;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

/* ==========================================================================
   Brand Logo
   ========================================================================== */
.brand-header {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding-bottom: 0.25rem;
}

.logo-mark {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.25));
}

.logo-ring {
    fill: none;
    stroke: var(--tick-major);
    stroke-width: 2.5;
    transition: stroke var(--transition-speed) ease;
}

.logo-tick {
    stroke: var(--tick-major);
    stroke-width: 2;
    stroke-linecap: round;
    transition: stroke var(--transition-speed) ease;
}

.logo-hr {
    stroke: var(--hand-hr);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke var(--transition-speed) ease;
}

.logo-min {
    stroke: var(--hand-min);
    stroke-width: 2.5;
    stroke-linecap: round;
    transition: stroke var(--transition-speed) ease;
}

.logo-sec {
    stroke: var(--hand-sec);
    stroke-width: 1.5;
    stroke-linecap: round;
    transition: stroke var(--transition-speed) ease;
}

.logo-cap {
    fill: var(--hand-sec);
    transition: fill var(--transition-speed) ease;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.brand-name {
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--text-primary);
}

.brand-sub {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* ==========================================================================
   Header & Controls Bar
   ========================================================================== */
.controls-bar {
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 16px;
    padding: 0.85rem 1.25rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.control-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.control-select {
    background: var(--control-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 0.35rem 0.6rem;
    font-family: var(--font-primary);
    font-size: 0.825rem;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.control-select:hover, .control-select:focus {
    border-color: var(--badge-text);
}

.toggle-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-toggle {
    background: var(--control-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 0.35rem 0.65rem;
    font-family: var(--font-primary);
    font-size: 0.8rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-toggle:hover {
    background: var(--badge-bg);
    color: var(--badge-text);
    border-color: var(--badge-text);
    transform: translateY(-1px);
}

.btn-toggle.active {
    background: var(--badge-bg);
    color: var(--badge-text);
    border-color: var(--badge-text);
}

/* ==========================================================================
   Clock Card & Analog Face
   ========================================================================== */
.clock-card {
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 28px;
    padding: 2.25rem 1.5rem 1.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.75rem;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
    transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.clock-wrapper {
    position: relative;
    width: clamp(250px, 75vw, 310px);
    height: clamp(250px, 75vw, 310px);
}

.clock-face {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: var(--clock-bg);
    box-shadow: var(--clock-shadow), var(--clock-inner-shadow);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

/* SVG Tick Marks & Numbers */
.ticks-svg {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.tick-mark {
    stroke: var(--tick-minor);
    stroke-linecap: round;
    transition: stroke var(--transition-speed) ease;
}

.tick-mark.major {
    stroke: var(--tick-major);
}

.clock-number {
    fill: var(--num-color);
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 16px;
    text-anchor: middle;
    dominant-baseline: central;
    transition: fill var(--transition-speed) ease;
}

/* Hand Positioning & Styling */
.hand {
    position: absolute;
    bottom: 50%;
    left: 50%;
    transform-origin: 50% 100%;
    border-radius: 10px;
    z-index: 2;
    will-change: transform;
}

.hr-hand {
    width: 7px;
    height: 28%;
    margin-left: -3.5px;
    background: var(--hand-hr);
    z-index: 2;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.min-hand {
    width: 4.5px;
    height: 38%;
    margin-left: -2.25px;
    background: var(--hand-min);
    z-index: 3;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.sec-hand {
    width: 2px;
    height: 44%;
    margin-left: -1px;
    background: var(--hand-sec);
    z-index: 4;
    box-shadow: 0 0 12px var(--sec-glow);
}

.center-cap {
    position: absolute;
    width: 14px;
    height: 14px;
    background: var(--cap-bg);
    border: 3px solid var(--cap-border);
    border-radius: 50%;
    z-index: 5;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

/* ==========================================================================
   Digital Display Sub-Panel
   ========================================================================== */
.digital-display {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.digital-time-row {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.digital-time {
    font-family: var(--font-mono);
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.digital-ampm {
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
}

.digital-date {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.timezone-badge {
    margin-top: 0.2rem;
    background: var(--badge-bg);
    color: var(--badge-text);
    padding: 0.2rem 0.75rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.app-footer {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.8;
    text-align: center;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */
@media (max-width: 400px) {
    .controls-bar {
        justify-content: center;
    }
    .digital-time {
        font-size: 1.85rem;
    }
}