/* =============================================
   THEME VARIABLES — matches tuner
   ============================================= */
:root {
    --tuner-target:  #21CE98;
    --tuner-out:     #F2005D;
    --tuner-in:      #2AFDC1;
    --tuner-tint:    #F2005D;

    --page-bg:       #0a0a0a;
    --card-bg:       #1c1c1c;
    --card-border:   rgba(255,255,255,0.09);
    --card-shadow:   0 24px 80px rgba(0,0,0,0.6);
    --text-primary-t:   #ffffff;
    --text-secondary-t: rgba(255,255,255,0.45);
    --text-muted-t:     rgba(255,255,255,0.22);

    --inst-bg: var(--page-bg);
    --inst-bg-card: var(--card-bg);
    --inst-text: var(--text-primary-t);
    --inst-text-muted: var(--text-secondary-t);
    --inst-border: var(--card-border);
    --ti-track:      rgba(255,255,255,0.12);
    --control-bg:    #2a2a2a;
    --control-border:rgba(255,255,255,0.1);
    --select-arrow:  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23ffffff' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
}

/* Light mode — prefers-color-scheme */
@media (prefers-color-scheme: light) {
    html:not([data-theme="dark"]) {
        --page-bg:       #f0f0f0;
        --card-bg:       #ffffff;
        --card-border:   rgba(0,0,0,0.08);
        --card-shadow:   0 24px 80px rgba(0,0,0,0.12);
        --text-primary-t:   #000000;
        --text-secondary-t: rgba(0,0,0,0.45);
        --text-muted-t:     rgba(0,0,0,0.25);
        --ti-track:      rgba(0,0,0,0.12);
        --control-bg:    #f0f0f0;
        --control-border:rgba(0,0,0,0.12);
        --select-arrow:  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23333333' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    }
}

/* Explicit light override */
html[data-theme="light"] {
    --page-bg:       #f0f0f0;
    --card-bg:       #ffffff;
    --card-border:   rgba(0,0,0,0.08);
    --card-shadow:   0 24px 80px rgba(0,0,0,0.12);
    --text-primary-t:   #000000;
    --text-secondary-t: rgba(0,0,0,0.45);
    --text-muted-t:     rgba(0,0,0,0.25);
    --ti-track:      rgba(0,0,0,0.12);
    --control-bg:    #f0f0f0;
    --control-border:rgba(0,0,0,0.12);
    --select-arrow:  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23333333' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
}

/* =============================================
   PAGE LAYOUT
   ============================================= */
body {
    background: var(--page-bg);
    transition: background 0.3s ease;
}

.metronome-page {
    padding: calc(var(--header-height, 80px) + 2.5rem) 1rem 5rem;
}

.metronome-page .container {
    max-width: 700px;
    margin: 0 auto;
}

/* =============================================
   PAGE HEADER
   ============================================= */
@keyframes headerSlideUp {
    from { opacity: 0; transform: translateY(40px); }
    to   { opacity: 1; transform: translateY(0); }
}

.metronome-page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.metronome-page-header h1 {
    font-size: clamp(1.6rem, 4vw, 2.5rem);
    font-weight: 700;
    background: linear-gradient(91deg, #ff00d0, #fff000);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: 0.5rem;
    display: inline-block;
    animation: headerSlideUp 1s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

.metronome-page-header p {
    font-size: 1rem;
    background: linear-gradient(91deg, #ff00d0, #fff000);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    animation: headerSlideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s both;
}

.metronome-page-byline {
    display: block;
    font-size: 0.9375rem;
    color: var(--text-secondary-t) !important;
    background: none !important;
    -webkit-background-clip: unset !important;
    -webkit-text-fill-color: unset !important;
    background-clip: unset !important;
    max-width: 520px;
    margin: 0.75rem auto 0;
    line-height: 1.6;
    animation: headerSlideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.75s both;
}

/* =============================================
   METRONOME CARD
   ============================================= */
.metronome-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    padding: 1.5rem 1.5rem 2rem;
    transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Glow effect when playing */
.metronome-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 24px;
    background: radial-gradient(ellipse at 50% 50%, rgba(42,253,193,0.15) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
    z-index: 0;
}

.metronome-card.playing::before {
    opacity: 1;
}

.metronome-card > * {
    position: relative;
    z-index: 1;
}

/* =============================================
   BPM DISPLAY
   ============================================= */
.bpm-display {
    text-align: center;
    padding: 1rem 0 0.5rem;
}

.bpm-value {
    font-size: 4rem;
    font-weight: 700;
    color: var(--tuner-target);
    line-height: 1;
    font-variant-numeric: tabular-nums;
    display: block;
}

.bpm-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted-t);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: block;
    margin-top: 0.25rem;
}

/* =============================================
   BPM CONTROLS — slider + step buttons
   ============================================= */
.bpm-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.bpm-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--ti-track);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.bpm-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--tuner-target);
    border: 2px solid var(--card-bg);
    box-shadow: 0 1px 6px rgba(0,0,0,0.3);
    cursor: pointer;
    transition: transform 0.12s ease;
}

.bpm-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.bpm-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--tuner-target);
    border: 2px solid var(--card-bg);
    box-shadow: 0 1px 6px rgba(0,0,0,0.3);
    cursor: pointer;
}

.bpm-step-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    color: var(--text-primary-t);
    font-size: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s, transform 0.12s;
    user-select: none;
    flex-shrink: 0;
    font-family: 'Inter', -apple-system, sans-serif;
    line-height: 1;
    padding: 0;
}

.bpm-step-btn:hover {
    background: rgba(127,127,127,0.2);
    transform: scale(1.05);
}

.bpm-step-btn:active {
    transform: scale(0.95);
}

/* =============================================
   OPTIONS ROW — time sig + subdivisions
   ============================================= */
.metronome-options {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
}

.option-label {
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--text-muted-t);
}

/* Select dropdown */
.metro-select {
    height: 36px;
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    border-radius: 10px;
    color: var(--text-primary-t);
    font-family: 'Inter', -apple-system, sans-serif;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0 2rem 0 0.75rem;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    outline: none;
    transition: border-color 0.15s;
    background-image: var(--select-arrow);
    background-repeat: no-repeat;
    background-position: right 10px center;
}

.metro-select:focus {
    border-color: var(--tuner-tint);
}

.metro-select option {
    background: var(--card-bg);
    color: var(--text-primary-t);
}

/* Subdivision buttons */
.subdiv-btns {
    display: flex;
    gap: 0.25rem;
}

.subdiv-btn {
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    color: var(--text-secondary-t);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: 'Inter', -apple-system, sans-serif;
    line-height: 1;
}

.subdiv-btn:hover {
    color: var(--text-primary-t);
    border-color: var(--text-muted-t);
}

.subdiv-btn.active {
    background: var(--tuner-target);
    color: #000;
    border-color: var(--tuner-target);
}

/* =============================================
   BEAT INDICATOR
   ============================================= */
.beat-indicator {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    padding: 1.5rem 0;
}

.beat-dot {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--card-border);
    background: transparent;
    transition: all 0.08s ease;
}

.beat-dot.active {
    background: var(--tuner-target);
    border-color: var(--tuner-target);
    transform: scale(1.15);
    box-shadow: 0 0 12px rgba(33, 206, 152, 0.4);
}

.beat-dot.accent {
    border-color: var(--tuner-tint);
}

.beat-dot.accent.active {
    background: var(--tuner-tint);
    border-color: var(--tuner-tint);
    box-shadow: 0 0 12px rgba(242, 0, 93, 0.4);
}

/* =============================================
   START BUTTON
   ============================================= */
.start-btn-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.625rem;
    position: relative;
}

/* Notes container sits over the button, overflows freely */
.start-btn-wrap .button-notes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    height: 54px;
    pointer-events: none;
    overflow: visible;
}

.start-btn-wrap .flying-note {
    position: absolute;
    font-size: 1rem;
    color: var(--tuner-in);
    pointer-events: none;
    z-index: 10;
    animation: flyOut 2s ease-out forwards;
}

@property --btn-angle {
    syntax: '<angle>';
    inherits: false;
    initial-value: 0deg;
}

@keyframes rotateBorder {
    to { --btn-angle: 360deg; }
}

/* Kinetic border wrapper */
.start-btn-border {
    width: 100%;
    padding: 2px;
    border-radius: 16px;
    background: conic-gradient(
        from var(--btn-angle),
        rgba(42, 253, 193, 0.45),
        rgba(33, 206, 152, 0.45),
        rgba(255, 0, 208, 0.45),
        rgba(255, 240, 0, 0.45),
        rgba(42, 253, 193, 0.45)
    );
    animation: rotateBorder 4s linear infinite;
    transition: opacity 0.3s;
}

.start-btn-border:hover {
    animation-duration: 2s;
}

/* Muted border when running */
.start-btn-border:has(.start-btn.running) {
    background: var(--control-border);
    animation: none;
}

.start-btn {
    width: 100%;
    padding: 0.875rem 1.5rem;
    border-radius: 14px;
    font-family: 'Inter', -apple-system, sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    cursor: pointer;
    position: relative;
    background: linear-gradient(135deg, rgba(255,0,208,0.12) 0%, rgba(42,253,193,0.08) 50%, rgba(255,240,0,0.07) 100%), #eee;
    border: none;
    color: #111;
    box-shadow: 0 4px 24px rgba(33, 206, 152, 0.12);
    transition: box-shadow 0.3s, transform 0.12s, background 0.3s, color 0.3s;
}

.start-btn:hover {
    box-shadow:
        0 6px 36px rgba(33, 206, 152, 0.28),
        0 0 60px rgba(33, 206, 152, 0.08);
    transform: translateY(-1px);
}

.start-btn:active {
    transform: translateY(0);
}

.start-btn.running {
    background: var(--control-bg);
    color: var(--text-secondary-t);
    box-shadow: none;
}

/* =============================================
   TAP TEMPO BUTTON
   ============================================= */
.tap-btn {
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    border-radius: 12px;
    color: var(--text-secondary-t);
    font-family: 'Inter', -apple-system, sans-serif;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.625rem 1.5rem;
    cursor: pointer;
    transition: color 0.15s, background 0.15s, border-color 0.15s, transform 0.12s;
    user-select: none;
    width: 100%;
}

.tap-btn:hover {
    color: var(--text-primary-t);
    border-color: var(--text-muted-t);
}

.tap-btn:active {
    transform: scale(0.98);
    background: rgba(127,127,127,0.15);
}

/* =============================================
   HOW TO USE — COLLAPSIBLE (inside card)
   ============================================= */
.metronome-explainer {
    margin-top: 1.25rem;
    border-top: 1px solid var(--card-border);
    padding-top: 0.875rem;
}

.metronome-explainer summary {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary-t);
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: color 0.15s;
    width: fit-content;
}

.metronome-explainer summary::-webkit-details-marker { display: none; }
.metronome-explainer summary::marker { display: none; }

.metronome-explainer summary:hover {
    color: var(--text-primary-t);
}

.metronome-explainer-icon {
    opacity: 0.5;
    flex-shrink: 0;
}

.metronome-explainer-body {
    margin-top: 0.875rem;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.metronome-tip {
    display: grid;
    grid-template-columns: 5.5rem 1fr;
    gap: 0 0.625rem;
    align-items: baseline;
}

.metronome-tip-label {
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--text-muted-t);
    padding-top: 0.125rem;
    line-height: 1.55;
}

.metronome-tip p {
    font-size: 0.75rem;
    color: var(--text-secondary-t);
    line-height: 1.55;
    margin: 0;
}

.metronome-tip p strong {
    color: var(--text-primary-t);
    font-weight: 600;
}

.metronome-tip p em {
    font-style: italic;
}

/* =============================================
   ABOUT SECTION
   ============================================= */
.metronome-about {
    margin-top: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--card-border);
    animation: headerSlideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.7s both;
}

.metronome-about p {
    font-size: 0.9375rem;
    color: var(--text-secondary-t);
    line-height: 1.7;
    margin: 0;
}

/* =============================================
   RELATED LINKS NAV
   ============================================= */
.metronome-related {
    padding: 0.75rem 0;
    font-size: 0.8125rem;
    color: var(--text-muted-t);
    line-height: 2;
}

.metronome-related a {
    color: var(--text-secondary-t);
    text-decoration: none;
    transition: color 0.15s;
}

.metronome-related a:hover {
    color: var(--text-primary-t);
}

/* =============================================
   UPSELL SECTION
   ============================================= */
.metronome-upsell {
    margin-top: 0;
    padding: 2rem 1.5rem;
    text-align: center;
}

.metronome-upsell h2 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary-t);
    margin-bottom: 0.375rem;
}

.metronome-upsell .upsell-sub {
    font-size: 0.9375rem;
    color: var(--text-secondary-t);
    margin-bottom: 1.25rem;
}

.upsell-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.upsell-tag {
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    color: var(--text-secondary-t);
    border-radius: 100px;
    padding: 0.25rem 0.75rem;
    font-size: 0.8125rem;
}

.upsell-store-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.upsell-learn-more {
    display: inline-block;
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary-t);
    text-decoration: none;
    transition: color 0.15s;
}

.upsell-learn-more:hover {
    color: var(--text-primary-t);
}

/* =============================================
   LIGHT THEME OVERRIDES — Navbar & Header
   ============================================= */
@media (prefers-color-scheme: light) {
    html:not([data-theme="dark"]) .navbar {
        background: rgba(255, 255, 255, 0.75);
        border: 1px solid rgba(0, 0, 0, 0.08);
    }
    html:not([data-theme="dark"]) .navbar .nav-logo,
    html:not([data-theme="dark"]) .navbar .nav-link {
        color: #1a1a1a;
    }
    html:not([data-theme="dark"]) .metronome-page-header h1,
    html:not([data-theme="dark"]) .metronome-page-header p:not(.metronome-page-byline) {
        background: linear-gradient(91deg, #cc0099, #667eea);
        -webkit-background-clip: text;
        background-clip: text;
    }
    html:not([data-theme="dark"]) .start-btn {
        background: linear-gradient(135deg, rgba(255,0,208,0.12) 0%, rgba(42,253,193,0.08) 50%, rgba(255,240,0,0.07) 100%), #111;
        color: #2AFDC1;
    }
    html:not([data-theme="dark"]) .start-btn.running {
        background: var(--control-bg);
    }
}

html[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

html[data-theme="light"] .navbar .nav-logo,
html[data-theme="light"] .navbar .nav-link {
    color: #1a1a1a;
}

html[data-theme="light"] .metronome-page-header h1,
html[data-theme="light"] .metronome-page-header p:not(.metronome-page-byline) {
    background: linear-gradient(91deg, #cc0099, #667eea);
    -webkit-background-clip: text;
    background-clip: text;
}

html[data-theme="light"] .start-btn {
    background: linear-gradient(135deg, rgba(255,0,208,0.12) 0%, rgba(42,253,193,0.08) 50%, rgba(255,240,0,0.07) 100%), #111;
    color: #2AFDC1;
}

html[data-theme="light"] .start-btn.running {
    background: var(--control-bg);
}

/* Nav logo link */
a.nav-logo {
    text-decoration: none;
    cursor: pointer;
}

a.nav-logo .logo-icon {
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.25s ease;
}

a.nav-logo:hover .logo-icon {
    transform: scale(1.1) rotate(-4deg);
    filter: brightness(1.15);
}

a.nav-logo:hover .logo-text {
    opacity: 0.75;
    transition: opacity 0.2s ease;
}

/* Dark mode navbar glass background */
.navbar {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* =============================================
   RESPONSIVE — below 600px
   ============================================= */
@media (max-width: 600px) {
    .metronome-card {
        padding: 1.25rem 1rem 1.5rem;
        border-radius: 18px;
    }

    .bpm-value {
        font-size: 3rem;
    }

    .bpm-controls {
        gap: 0.5rem;
    }

    .bpm-step-btn {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .metronome-options {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .beat-indicator {
        gap: 0.5rem;
        padding: 1rem 0;
    }

    .beat-dot {
        width: 22px;
        height: 22px;
    }

    .metronome-tip {
        grid-template-columns: 1fr;
        gap: 0.125rem;
    }

    .metronome-upsell {
        padding: 1.5rem 1rem;
    }
}