:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: #141619;
    --bg-gradient-start: #1a2a3a;
    --bg-gradient-end: #0f1214;
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-muted: #a0aec0;
    --text-secondary: #ccc;

    --cyan-primary: #00d2ff;
    --cyan-glow: rgba(0, 210, 255, 0.3);
    --cyan-glow-strong: rgba(0, 210, 255, 0.6);
    --cyan-bg-subtle: rgba(0, 210, 255, 0.1);
    --cyan-border: rgba(0, 210, 255, 0.3);

    --card-bg: rgba(20, 25, 30, 0.85);
    --card-border: rgba(0, 210, 255, 0.3);
    --card-shadow: rgba(0, 210, 255, 0.05);

    --input-bg: rgba(0, 0, 0, 0.3);
    --input-bg-focus: rgba(0, 0, 0, 0.5);
    --input-border: rgba(255, 255, 255, 0.2);
    --input-text: #ffffff;

    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.15);

    --pill-bg: rgba(255, 255, 255, 0.05);
    --pill-border: rgba(255, 255, 255, 0.15);
    --pill-text: #e2e8f0;

    --btn-quick-bg: rgba(255, 255, 255, 0.05);
    --btn-quick-border: rgba(255, 255, 255, 0.2);
    --btn-quick-text: #e2e8f0;
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --bg-gradient-start: #e9ecef;
    --bg-gradient-end: #dee2e6;
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-muted: #6c757d;
    --text-secondary: #495057;

    --cyan-primary: #00768a;
    --cyan-glow: rgba(0, 118, 138, 0.2);
    --cyan-glow-strong: rgba(0, 118, 138, 0.4);
    --cyan-bg-subtle: rgba(0, 118, 138, 0.08);
    --cyan-border: rgba(0, 118, 138, 0.4);

    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.15);
    --card-shadow: rgba(0, 0, 0, 0.08);

    --input-bg: #ffffff;
    --input-bg-focus: #f8f9fa;
    --input-border: rgba(0, 0, 0, 0.25);
    --input-text: #212529;

    --border-subtle: rgba(0, 0, 0, 0.15);
    --border-secondary: rgba(0, 0, 0, 0.2);

    --pill-bg: #f1f5f9;
    --pill-border: rgba(0, 0, 0, 0.15);
    --pill-text: #334155;

    --btn-quick-bg: #f1f5f9;
    --btn-quick-border: rgba(0, 0, 0, 0.2);
    --btn-quick-text: #334155;
}

body {
    background: radial-gradient(circle at top center, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 80%) !important;
    color: var(--text-main);
    min-height: 100vh;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.content-wrapper h1,
.content-wrapper h2,
.content-wrapper h3,
.content-wrapper h4,
.content-wrapper h5 {
    color: var(--text-title);
}

.alarm-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.75rem;
    box-shadow: 0 10px 25px -5px var(--card-shadow);
    margin-bottom: 2rem;
    color: var(--text-main);
}

.form-label {
    color: var(--text-title) !important;
}

.form-control {
    background-color: var(--input-bg) !important;
    border: 1px solid var(--input-border) !important;
    color: var(--input-text) !important;
}

.form-control:focus {
    background-color: var(--input-bg-focus) !important;
    border-color: var(--cyan-primary) !important;
    box-shadow: 0 0 0 0.25rem var(--cyan-glow) !important;
    color: var(--input-text) !important;
}

.mode-tab-btn {
    border-radius: 0.75rem;
    font-weight: 600;
    padding: 0.75rem 1rem;
    transition: all 0.2s ease-in-out;
}

.quick-btn {
    border-radius: 0.6rem;
    font-weight: 600;
    padding: 0.6rem 0.5rem;
    font-size: 0.95rem;
    border: 1px solid var(--btn-quick-border);
    background: var(--btn-quick-bg);
    color: var(--btn-quick-text);
}

.quick-btn:hover, .quick-btn.active {
    background: #0284c7;
    color: #ffffff;
    border-color: #0369a1;
}

.timer-display {
    font-family: monospace, monospace;
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--cyan-primary);
    text-shadow: 0 0 20px var(--cyan-glow);
    margin: 1.25rem 0;
}

.action-btn-primary {
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    color: #ffffff;
    font-size: 1.15rem;
    font-weight: 700;
    padding: 1rem 1.5rem;
    border-radius: 0.85rem;
    border: none;
    box-shadow: 0 4px 15px rgba(2, 132, 199, 0.4);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.action-btn-primary:active {
    transform: scale(0.98);
}

.action-btn-secondary {
    background: linear-gradient(135deg, #475569 0%, #334155 100%);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.85rem 1.25rem;
    border-radius: 0.85rem;
    border: none;
}

.notice-pill {
    cursor: pointer;
    border-radius: 0.5rem;
    padding: 0.6rem 0.75rem;
    background: var(--pill-bg);
    border: 1px solid var(--pill-border);
    color: var(--pill-text);
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
}

.notice-pill.selected {
    background: #0ea5e9;
    color: #ffffff;
    border-color: #0284c7;
}

/* --- THEME TOGGLE BUTTON --- */
.theme-toggle {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 45px;
    height: 45px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 15px var(--card-shadow);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle i {
    font-size: 1.2rem;
    color: var(--cyan-primary);
}

@media (max-width: 576px) {
    .timer-display {
        font-size: 2.75rem;
    }
    
    .action-btn-primary {
        font-size: 1rem;
        padding: 0.85rem 1rem;
    }
}