/* 
   ChordCalm - Nano Banana Style System
   Utility-first, calm, and trustworthy design.
*/

:root {
    /* Colors – warmer, autism-friendly */
    --primary: #4c9ea6;
    /* soft teal */
    --primary-light: #d7f0f2;
    --primary-dark: #2d6b72;

    --bg-light: #faf7f4;
    /* warm off-white */
    --text-main: #1e293b;
    --text-muted: #475569;
    --white: #ffffff;

    /* Category Colors */
    --cat-sleep: #6366f1;
    /* soft indigo */
    --cat-sleep-bg: #e0e7ff;
    --cat-meltdown: #ea580c;
    /* warm amber */
    --cat-meltdown-bg: #ffedd5;
    --cat-transition: #16a34a;
    /* soft green */
    --cat-transition-bg: #dcfce7;

    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;

    /* Typography */
    --font-display: 'Nunito', system-ui, -apple-system, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
}

/* Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.01em;
}

/* Nano Banana Layout Utilities */
.nb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.nb-flex {
    display: flex;
}

.nb-flex-col {
    flex-direction: column;
}

.nb-items-center {
    align-items: center;
}

.nb-justify-between {
    justify-content: space-between;
}

.nb-justify-center {
    justify-content: center;
}

.nb-grid {
    display: grid;
}

.nb-gap-sm {
    gap: var(--space-xs);
}

.nb-gap-md {
    gap: var(--space-sm);
}

.nb-gap-lg {
    gap: var(--space-md);
}

/* Spacing Utilities */
.nb-p-md {
    padding: var(--space-md);
}

.nb-py-lg {
    padding-top: var(--space-lg);
    padding-bottom: var(--space-lg);
}

.nb-mt-md {
    margin-top: var(--space-md);
}

.nb-mb-sm {
    margin-bottom: var(--space-xs);
}

.nb-mb-md {
    margin-bottom: var(--space-sm);
}

.nb-mb-lg {
    margin-bottom: var(--space-md);
}

/* Components */
.nb-card {
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.nb-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.nb-pill {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    letter-spacing: 0.05em;
    display: inline-block;
}

.nb-pill-sleep {
    color: var(--cat-sleep);
    background: var(--cat-sleep-bg);
}

.nb-pill-meltdown {
    color: var(--cat-meltdown);
    background: var(--cat-meltdown-bg);
}

.nb-pill-transition {
    color: var(--cat-transition);
    background: var(--cat-transition-bg);
}

.nb-btn {
    padding: 0.8rem 2rem;
    border-radius: 100px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-body);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.nb-btn-primary {
    background: var(--primary);
    color: var(--white);
}

.nb-btn-primary:hover {
    background: var(--primary-dark);
    transform: scale(1.02);
}

.nb-btn-outline {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary-light);
}

.nb-btn-outline:hover {
    border-color: var(--primary);
}

/* Navigation */
header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

header.scrolled {
    height: 70px;
}

nav {
    height: 90px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 600;
    color: var(--text-main);
    position: relative;
    text-decoration: none;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Audio List Specific */
.audio-track-list {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.track-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Category-tinted cards */
.track-card.sleep {
    border-left: 4px solid var(--cat-sleep);
    background: var(--cat-sleep-bg);
}

.track-card.meltdown {
    border-left: 4px solid var(--cat-meltdown);
    background: var(--cat-meltdown-bg);
}

.track-card.transition {
    border-left: 4px solid var(--cat-transition);
    background: var(--cat-transition-bg);
}

.audio-controls {
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.play-pause-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.play-pause-btn:hover {
    background: var(--primary);
    color: var(--white);
}

/* Soft waveform indicator */
.waveform {
    display: flex;
    gap: 4px;
    align-items: flex-end;
    margin-bottom: 0.5rem;
    height: 16px;
}

.wave-bar {
    width: 3px;
    height: 8px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.6);
}

/* Animate only when track-card has .is-playing */
.track-card.is-playing .wave-bar:nth-child(1) {
    animation: softPulse 1.6s ease-in-out infinite;
}

.track-card.is-playing .wave-bar:nth-child(2) {
    animation: softPulse 1.6s ease-in-out infinite 0.2s;
}

.track-card.is-playing .wave-bar:nth-child(3) {
    animation: softPulse 1.6s ease-in-out infinite 0.4s;
}

.track-card.is-playing .wave-bar:nth-child(4) {
    animation: softPulse 1.6s ease-in-out infinite 0.6s;
}

@keyframes softPulse {

    0%,
    100% {
        height: 8px;
        opacity: 0.5;
    }

    50% {
        height: 16px;
        opacity: 0.9;
    }
}

.progress-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

input[type="range"].nb-slider {
    width: 100%;
    height: 6px;
    appearance: none;
    -webkit-appearance: none;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

input[type="range"].nb-slider::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

input[type="range"].nb-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Now Playing Bar */
.now-playing-bar {
    position: sticky;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--white);
    padding: 1rem 2rem;
    border-radius: 50px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    z-index: 900;
    display: none;
    /* Shown via JS */
    border: 1px solid var(--primary-light);
}

.now-playing-bar.active {
    display: flex;
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        transform: translate(-50%, 100%);
        opacity: 0;
    }

    to {
        transform: translate(-50%, 0);
        opacity: 1;
    }
}

/* Parents vs clinicians visual hierarchy */
.section-parents {
    background: rgba(252, 247, 242, 0.9);
    border-radius: 24px;
    padding: 2.5rem;
}

.section-clinicians {
    background: var(--white);
    border-radius: 24px;
    padding: 2.5rem;
    border: 1px solid rgba(148, 163, 184, 0.25);
}

/* Footer */
footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 5rem 0 3rem;
    margin-top: 5rem;
}

.footer-logo {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    font-family: var(--font-display);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    nav {
        height: 70px;
    }

    .nb-container {
        padding: 0 1rem;
    }

    .section-parents,
    .section-clinicians {
        padding: 1.5rem;
    }
}