/* ==========================================================================
   VibeAudio Landing Page Foundation — Stage A
   Tactile Editorial Listening Sanctuary
   ========================================================================== */

:root {
    --landing-bg: var(--color-canvas);
    --landing-surface: var(--color-surface-1);
    --landing-surface-strong: var(--color-surface-2);
    --landing-surface-hover: var(--color-surface-3);
    --landing-border: var(--color-border);
    --landing-border-strong: var(--color-border-strong);
    --landing-text: var(--color-text-primary);
    --landing-text-soft: var(--color-text-secondary);
    --landing-text-dim: var(--color-text-dim);
    --landing-accent: var(--color-accent);
    --landing-accent-hover: var(--color-accent-hover);
    --landing-accent-soft: var(--color-accent-soft);
    --landing-shadow: var(--shadow-card);
}

html {
    color-scheme: dark;
    background-color: var(--color-canvas);
}

body.landing-page {
    margin: 0;
    padding-bottom: 0;
    min-height: 100vh;
    color: var(--color-text-primary);
    background-color: var(--color-canvas);
    background-image:
        radial-gradient(ellipse 70% 40% at 20% 0%, rgba(229, 169, 60, 0.07), transparent 60%),
        radial-gradient(ellipse 60% 30% at 80% 10%, rgba(78, 186, 135, 0.04), transparent 50%),
        linear-gradient(180deg, #0C0D11 0%, #090A0E 50%, #07080B 100%);
    background-attachment: fixed;
    overflow-x: hidden;
    font-family: var(--font-body);
}

.landing-shell {
    width: min(1200px, calc(100% - 48px));
    margin: 0 auto;
    padding: 24px 0 60px;
    position: relative;
    z-index: 1;
}

/* ==========================================================================
   BUTTON SYSTEM (STAGE A WARM AMBER & SURFACE TOKENS)
   ========================================================================== */
.solid-btn,
.ghost-btn,
.btn-secondary {
    min-height: 44px;
    padding: 11px 22px;
    border-radius: var(--radius-pill);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: background var(--transition-fast),
                color var(--transition-fast),
                border-color var(--transition-fast),
                transform var(--transition-fast),
                box-shadow var(--transition-fast);
}

/* Primary Action: Warm Amber */
.solid-btn {
    background: var(--color-accent);
    color: #0C0D11 !important;
    border: 1px solid var(--color-accent);
    box-shadow: 0 4px 18px rgba(229, 169, 60, 0.28);
}

.solid-btn:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #0C0D11 !important;
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(229, 169, 60, 0.38);
}

.solid-btn:active {
    transform: scale(0.97);
    box-shadow: 0 2px 10px rgba(229, 169, 60, 0.2);
}

/* Secondary Action: Surface with Subtle Border */
.ghost-btn,
.btn-secondary {
    background: var(--color-surface-2);
    color: var(--color-text-primary) !important;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-subtle);
}

.ghost-btn:hover,
.btn-secondary:hover {
    background: var(--color-surface-3);
    border-color: var(--color-border-strong);
    color: var(--color-text-primary) !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-card);
}

.ghost-btn:active,
.btn-secondary:active {
    transform: scale(0.97);
}

.solid-btn:focus-visible,
.ghost-btn:focus-visible,
.btn-secondary:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* ==========================================================================
   1. LANDING TOPBAR
   ========================================================================== */
.landing-topbar {
    position: sticky;
    top: 14px;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 22px;
    margin-bottom: 32px;
    border-radius: var(--radius-sheet);
    background: var(--color-surface-translucent);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: var(--shadow-card);
}

.brand-lockup {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    object-fit: cover;
    box-shadow: var(--shadow-subtle);
}

.brand-copy {
    display: grid;
    gap: 1px;
}

.brand-copy strong {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    line-height: 1.15;
}

.brand-copy span {
    color: var(--color-text-dim);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.topbar-reassurance-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    background: rgba(78, 186, 135, 0.1);
    border: 1px solid rgba(78, 186, 135, 0.25);
    color: var(--color-success);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* ==========================================================================
   2. HERO SECTION (BALANCED 2-COLUMN SANCTUARY)
   ========================================================================== */
.landing-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.24fr) minmax(320px, 400px);
    gap: 28px;
    align-items: stretch;
    margin-bottom: 32px;
}

.hero-main-panel,
.auth-panel,
.feature-panel,
.section-panel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-sheet);
    border: 1px solid var(--color-border);
    background: var(--color-surface-1);
    box-shadow: var(--shadow-card);
}

.hero-main-panel {
    padding: 38px 36px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--color-accent);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.4rem, 4.4vw, 3.8rem);
    line-height: 1.06;
    letter-spacing: -0.035em;
    color: var(--color-text-primary);
    margin: 0 0 16px;
}

.hero-title span {
    color: var(--color-accent);
    font-style: italic;
}

.hero-copy {
    max-width: 52ch;
    margin: 0 0 24px;
    color: var(--color-text-secondary);
    line-height: 1.68;
    font-size: 1.02rem;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 22px;
}

.hero-primary-btn {
    padding: 13px 28px;
    font-size: 0.96rem;
}

.hero-secondary-btn {
    padding: 13px 22px;
    font-size: 0.94rem;
}

/* Trust / Reassurance Row */
.hero-trust-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 24px;
}

.trust-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    color: var(--color-text-soft);
    font-size: 0.78rem;
    font-weight: 500;
}

.trust-badge i {
    color: var(--color-accent);
    font-size: 0.8rem;
}

/* Hero Metrics Grid */
.hero-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: auto;
}

.metric-card {
    padding: 14px 16px;
    border-radius: var(--radius-panel);
    border: 1px solid var(--color-border);
    background: var(--color-surface-2);
    box-shadow: var(--shadow-subtle);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.metric-card strong {
    display: block;
    font-family: var(--font-display);
    font-size: 1.55rem;
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--color-text-primary);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}

.metric-card span {
    color: var(--color-text-dim);
    font-size: 0.74rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    line-height: 1.3;
}

/* Right Hero Anchor Stage */
.hero-anchor-stage {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.hero-spotlight-card {
    height: 100%;
    padding: 28px;
    border-radius: var(--radius-sheet);
    background: var(--color-surface-1);
    border: 1px solid var(--color-border-strong);
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-image:
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(229, 169, 60, 0.12), transparent 70%),
        linear-gradient(180deg, var(--color-surface-1) 0%, #111319 100%);
}

.spotlight-header-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-accent);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.spotlight-media-wrap {
    width: 100%;
    max-width: 190px;
    margin: 0 auto 18px;
    aspect-ratio: 2 / 3;
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-elevated);
    border: 1px solid rgba(245, 246, 250, 0.14);
    background: var(--color-surface-2);
}

.featured-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-smooth);
}

.hero-spotlight-card:hover .featured-cover {
    transform: scale(1.03);
}

.spotlight-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: center;
    align-items: center;
}

.spotlight-kicker {
    color: var(--color-accent);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.spotlight-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text-primary);
    margin: 2px 0 2px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    text-overflow: ellipsis;
}

.spotlight-author {
    color: var(--color-text-dim);
    font-size: 0.84rem;
    margin: 0 0 8px;
}

.spotlight-desc {
    color: var(--color-text-secondary);
    font-size: 0.86rem;
    line-height: 1.5;
    margin: 0 0 14px;
    max-width: 32ch;
}

.spotlight-actions {
    display: flex;
    gap: 8px;
    justify-content: center;
    width: 100%;
}

.spotlight-btn {
    width: 100%;
    max-width: 220px;
}

/* ==========================================================================
   3. SECTION PANELS & PREVIEW GRID
   ========================================================================== */
.section-grid {
    display: grid;
    gap: 28px;
}

.section-panel {
    padding: 32px;
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 24px;
    gap: 16px;
    flex-wrap: wrap;
}

.section-head h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3vw, 2.3rem);
    font-weight: 600;
    line-height: 1.15;
    color: var(--color-text-primary);
    margin: 4px 0 6px;
}

.section-head p {
    color: var(--color-text-secondary);
    font-size: 0.94rem;
    margin: 0;
    max-width: 60ch;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.preview-card {
    padding: 12px;
    border-radius: var(--radius-card);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-fast),
                border-color var(--transition-fast),
                background var(--transition-fast),
                box-shadow var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.preview-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
    background: var(--color-surface-3);
    box-shadow: var(--shadow-card);
}

.preview-card img {
    width: 100%;
    aspect-ratio: 2 / 3;
    object-fit: cover;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-subtle);
    background: var(--color-surface-1);
    display: block;
}

.preview-copy {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 12px 4px 4px;
}

.preview-kicker {
    color: var(--color-accent);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.preview-card strong {
    font-family: var(--font-display);
    font-size: 1.12rem;
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-text-primary);
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    text-overflow: ellipsis;
}

.preview-card span {
    color: var(--color-text-dim);
    font-size: 0.82rem;
    margin: 0;
}

.preview-card p {
    color: var(--color-text-muted);
    font-size: 0.78rem;
    margin-top: 4px;
}

/* ==========================================================================
   4. FEATURE PANELS
   ========================================================================== */
.feature-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.feature-panel {
    padding: 26px 24px;
    background: var(--color-surface-1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-panel);
    box-shadow: var(--shadow-subtle);
}

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    margin-bottom: 16px;
}

.feature-panel h3 {
    font-family: var(--font-display);
    font-size: 1.28rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 8px;
    line-height: 1.2;
}

.feature-panel p {
    color: var(--color-text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
    margin: 0;
}

/* ==========================================================================
   5. AUTH CONTINUATION PANEL (QUIET, OPTIONAL CLOUD SYNC)
   ========================================================================== */
.auth-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(320px, 400px);
    gap: 32px;
    align-items: center;
    padding: 38px 36px;
    background:
        radial-gradient(ellipse 60% 40% at 85% 50%, rgba(229, 169, 60, 0.05), transparent 70%),
        var(--color-surface-1);
}

.auth-panel-copy {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.auth-panel h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 2.8vw, 2.4rem);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.15;
}

.auth-panel p {
    color: var(--color-text-secondary);
    font-size: 0.94rem;
    line-height: 1.65;
    margin: 0;
    max-width: 48ch;
}

.auth-chip-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.auth-chip {
    padding: 6px 12px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    color: var(--color-text-soft);
    font-size: 0.76rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.auth-chip i {
    color: var(--color-accent);
    font-size: 0.76rem;
}

.auth-guest-callout {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--color-divider);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.auth-guest-callout span {
    color: var(--color-text-dim);
    font-size: 0.86rem;
}

.auth-widget-stage {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.landing-status {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    color: var(--color-text-dim);
    font-size: 0.84rem;
    line-height: 1.4;
}

.sign-in-shell {
    padding: 20px;
    border-radius: var(--radius-panel);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

/* ==========================================================================
   6. LISTENING LANES (TAG CLUSTER)
   ========================================================================== */
.tag-cluster {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tag-cluster span {
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    font-size: 0.82rem;
    color: var(--color-text-soft);
    letter-spacing: 0.02em;
    font-weight: 500;
    transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.tag-cluster span:hover {
    background: var(--color-surface-3);
    border-color: var(--color-border-strong);
    color: var(--color-text-primary);
}

/* ==========================================================================
   7. FOOTER CALLOUT & SEMANTIC FOOTER
   ========================================================================== */
.footer-callout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-callout-text strong {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-text-primary);
    display: block;
    margin-bottom: 4px;
}

.footer-callout-text p {
    color: var(--color-text-secondary);
    font-size: 0.94rem;
    margin: 0;
}

.footer-callout-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.landing-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 32px 6px 12px;
    margin-top: 36px;
    border-top: 1px solid var(--color-divider);
    color: var(--color-text-dim);
    font-size: 0.84rem;
    flex-wrap: wrap;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-brand-mark {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.footer-brand strong {
    font-family: var(--font-display);
    font-size: 1.05rem;
    color: var(--color-text-primary);
    margin-right: 8px;
}

.footer-meta {
    color: var(--color-text-muted);
    font-size: 0.82rem;
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1040px) {
    .landing-hero {
        grid-template-columns: 1fr;
    }

    .hero-anchor-stage {
        display: none;
    }

    .preview-grid,
    .feature-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .auth-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .landing-shell {
        width: min(100%, calc(100% - 28px));
        padding-top: 14px;
        padding-bottom: 40px;
    }

    .landing-topbar {
        padding: 10px 14px;
        margin-bottom: 20px;
        top: 8px;
    }

    .topbar-reassurance-chip {
        display: none;
    }

    .topbar-browse-btn {
        display: none;
    }

    .hero-main-panel,
    .section-panel,
    .auth-panel {
        padding: 24px 18px;
        border-radius: var(--radius-panel);
    }

    .hero-title {
        font-size: clamp(2rem, 8.5vw, 2.8rem);
    }

    .hero-metrics {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .preview-grid,
    .feature-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
    }

    .footer-callout {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-callout-actions {
        width: 100%;
    }

    .footer-callout-actions a,
    .footer-callout-actions button {
        width: 100%;
    }

    .landing-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .preview-grid,
    .feature-row {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions a,
    .hero-actions button {
        width: 100%;
    }

    .hero-trust-row {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}