/* ---------- BRAND TOKENS (North Light Path Aligned) ---------- */
:root {
    --midnight-navy: #0A1628;
    --arctic-blue: #1E3A5F;
    --aurora-green: #64FFDA;
    --northern-teal: #4A9B8E;
    --glacier-blue: #A8D8EA;
    --ice-white: #F0F4F8;
    --silver: #B8C5D6;
    --deep-charcoal: #2D3748;
    --white: #ffffff;
    
    /* App-specific semantic mapping */
    --bg-primary: var(--midnight-navy);
    --bg-secondary: var(--arctic-blue);
    --bg-card: rgba(30, 58, 95, 0.4);
    --accent-primary: var(--aurora-green);
    --accent-secondary: var(--northern-teal);
    --text-primary: var(--ice-white);
    --text-secondary: var(--silver);
    --text-muted: rgba(184, 197, 214, 0.7);
    --border-subtle: rgba(100, 255, 218, 0.2);
    --well-color: #6b705c; /* Muted olive for Well frequency */
    --fountain-color: var(--aurora-green);
    --unclear-color: var(--silver);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

/* Typography matching your site */
h1, h2, h3 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* ---------- LAYOUT ---------- */
#app {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
}

header {
    text-align: center;
    margin-bottom: 60px;
    padding-top: 20px;
}

header h1 {
    font-size: 2.2rem;
    color: var(--white);
    margin-bottom: 8px;
    font-weight: 700;
}

.subtitle {
    font-family: 'Inter', sans-serif;
    color: var(--aurora-green);
    font-size: 0.95rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-weight: 500;
    opacity: 0.9;
}

/* ---------- RECORDER INTERFACE ---------- */
#recorder {
    text-align: center;
    padding: 40px 20px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border-subtle);
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

#recorder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--aurora-green), transparent);
    opacity: 0.4;
}

#timer {
    font-family: 'Playfair Display', serif;
    font-size: 3rem;
    color: var(--white);
    display: block;
    margin-bottom: 30px;
    font-variant-numeric: tabular-nums;
}

#recordBtn {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 2px solid var(--aurora-green);
    background: transparent;
    color: var(--aurora-green);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    position: relative;
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.1);
}

#recordBtn:hover {
    background: rgba(100, 255, 218, 0.1);
    box-shadow: 0 0 30px rgba(100, 255, 218, 0.3);
    transform: scale(1.05);
}

#recordBtn.recording {
    background: rgba(100, 255, 218, 0.2);
    border-color: var(--aurora-green);
    color: var(--white);
    animation: pulse-aurora 2s infinite;
}

@keyframes pulse-aurora {
    0%, 100% { 
        box-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
        transform: scale(1);
    }
    50% { 
        box-shadow: 0 0 40px rgba(100, 255, 218, 0.6);
        transform: scale(1.02);
    }
}

.record-icon {
    font-size: 32px;
    margin-bottom: 8px;
    line-height: 1;
}

.recording-status {
    margin-top: 20px;
    color: var(--aurora-green);
    font-size: 0.9rem;
    letter-spacing: 1px;
}

/* ---------- TAGGING INTERFACE ---------- */
#tagging {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border-subtle);
    padding: 40px 30px;
    margin-bottom: 40px;
}

#tagging h2 {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: 10px;
    text-align: center;
}

#tagging h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background: var(--aurora-green);
    margin: 15px auto 30px;
    opacity: 0.6;
}

.category-group {
    margin-bottom: 30px;
}

label {
    display: block;
    margin-bottom: 10px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--aurora-green);
    text-transform: uppercase;
    letter-spacing: 2px;
}

select, textarea {
    width: 100%;
    padding: 14px 16px;
    background: rgba(10, 22, 40, 0.6);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--ice-white);
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    transition: all 0.3s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364FFDA' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
}

select:focus, textarea:focus {
    outline: none;
    border-color: var(--aurora-green);
    box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
}

textarea {
    resize: vertical;
    min-height: 80px;
    background-image: none;
}

.hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 8px;
    font-style: italic;
    opacity: 0.8;
}

/* ---------- BUTTONS ---------- */
.primary-btn {
    background: transparent;
    color: var(--aurora-green);
    border: 2px solid var(--aurora-green);
    padding: 16px 32px;
    border-radius: 50px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 1px;
    cursor: pointer;
    width: 100%;
    margin-top: 10px;
    transition: all 0.3s;
    text-transform: uppercase;
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.1);
}

.primary-btn:hover {
    background: var(--aurora-green);
    color: var(--midnight-navy);
    box-shadow: 0 10px 30px rgba(100, 255, 218, 0.3);
    transform: translateY(-2px);
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--silver);
    color: var(--silver);
    padding: 14px 32px;
    border-radius: 50px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    width: 100%;
    margin-top: 12px;
    transition: all 0.3s;
}

.secondary-btn:hover {
    border-color: var(--white);
    color: var(--white);
    background: rgba(255, 255, 255, 0.05);
}

/* ---------- LIBRARY ---------- */
#library {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-subtle);
}

#library h2 {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: 30px;
    text-align: center;
}

/* Filter buttons */
#filters {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--silver);
    padding: 8px 20px;
    border-radius: 20px;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
    letter-spacing: 0.5px;
}

.filter-btn:hover {
    border-color: var(--glacier-blue);
    color: var(--glacier-blue);
}

.filter-btn.active {
    background: var(--arctic-blue);
    border-color: var(--aurora-green);
    color: var(--aurora-green);
}

/* Recording Cards */
#recordingsList {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.recording-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    border-left: 4px solid var(--silver);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.recording-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(100, 255, 218, 0.3), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.recording-card:hover::before {
    opacity: 1;
}

.recording-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(100, 255, 218, 0.4);
}

/* Frequency-based coloring */
.recording-card.fountain {
    border-left-color: var(--fountain-color);
    background: linear-gradient(90deg, rgba(100, 255, 218, 0.05) 0%, var(--bg-card) 100%);
}

.recording-card.well {
    border-left-color: var(--well-color);
    background: linear-gradient(90deg, rgba(107, 112, 92, 0.1) 0%, var(--bg-card) 100%);
}

.recording-card.unclear {
    border-left-color: var(--unclear-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.freq-badge {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 12px;
    border-radius: 12px;
    background: rgba(100, 255, 218, 0.1);
    color: var(--aurora-green);
}

.recording-card.well .freq-badge {
    background: rgba(107, 112, 92, 0.2);
    color: #a0a896;
}

.recording-card.unclear .freq-badge {
    background: rgba(184, 197, 214, 0.1);
    color: var(--silver);
}

.date {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-family: 'Inter', sans-serif;
}

.tags {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    background: rgba(168, 216, 234, 0.1);
    color: var(--glacier-blue);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    text-transform: capitalize;
    letter-spacing: 0.5px;
    border: 1px solid rgba(168, 216, 234, 0.2);
}

.notes {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
    font-style: italic;
}

.play-btn {
    background: transparent;
    border: 1px solid var(--aurora-green);
    color: var(--aurora-green);
    padding: 10px 24px;
    border-radius: 20px;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.play-btn:hover {
    background: var(--aurora-green);
    color: var(--midnight-navy);
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
}

.play-btn::before {
    content: '▶';
    font-size: 0.7rem;
}

/* ---------- UTILITY ---------- */
.hidden {
    display: none !important;
}

/* Animation for transitions */
section {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 480px) {
    #app {
        padding: 20px 16px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    #tagging {
        padding: 30px 20px;
    }
    
    .recording-card {
        padding: 20px;
    }
}