/* ============================================================================
   TabDSP Landing Page Styles
   ----------------------------------------------------------------------------
   Loaded AFTER v2/css/main.css, components.css, and themes.css.
   Reuses v2 design tokens (--color-*, --spacing-*, --radius-*, --module-*).
   Defines landing-only classes prefixed with `.landing-` to avoid colliding
   with v2 (which uses `.section`, `.feature-card`, `.pricing-grid`, etc.).
   ============================================================================ */

/* ---------------------------------------------------------------------------
   Hero
   --------------------------------------------------------------------------- */

.landing-hero {
    position: relative;
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(6, 182, 212, 0.18) 0%, transparent 55%),
        radial-gradient(ellipse at 70% 80%, rgba(168, 85, 247, 0.12) 0%, transparent 55%),
        var(--color-bg-primary);
    overflow: hidden;
}

.landing-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 64px 64px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}

.landing-hero-inner {
    position: relative;
    max-width: 880px;
    margin: 0 auto;
    padding: var(--spacing-2xl) 0;
}

.landing-hero h1 {
    font-size: clamp(2.25rem, 5vw + 1rem, 3.75rem);
    font-weight: 700;
    line-height: 1.05;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.landing-hero h1 .landing-hero-accent {
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.landing-hero-sub {
    font-size: clamp(1.05rem, 1.2vw + 0.85rem, 1.35rem);
    color: var(--color-text-secondary);
    max-width: 640px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.5;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

/* `.btn-large` already exists in v2 main.css; we extend with a slightly
   stronger drop shadow for the hero context. */
.landing-hero .btn-large {
    min-width: 200px;
    justify-content: center;
}

.platform-badges {
    display: inline-flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.platform-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.platform-badge[data-status="full"] {
    color: var(--color-accent-green);
}

.platform-badge[data-status="planned"] {
    color: var(--color-text-tertiary);
    opacity: 0.7;
}

.platform-badge svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* ---------------------------------------------------------------------------
   Generic landing section rhythm (distinct from v2 .section)
   --------------------------------------------------------------------------- */

.landing-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.landing-section-alt {
    background: var(--color-bg-secondary);
}

.landing-section-cta {
    background: radial-gradient(ellipse at center, rgba(6, 182, 212, 0.12) 0%, transparent 70%);
}

.landing-container {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.landing-container-narrow {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.landing-section h2 {
    font-size: clamp(1.5rem, 2vw + 1rem, 2.25rem);
    text-align: center;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.landing-section-lede {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 720px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.6;
}

/* ---------------------------------------------------------------------------
   Feature grids (extends v2 .feature-card concept without colliding)
   --------------------------------------------------------------------------- */

.feature-grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.feature-grid-4up {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-grid-3up {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.landing-feature-card {
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.landing-feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.landing-feature-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.landing-feature-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin: 0;
}

.landing-feature-card .feature-link {
    margin-top: auto;
    padding-top: var(--spacing-sm);
}

/* Module accent: thin top border + matching icon background, mirroring
   the popup's --module-* tokens so the landing visually echoes the app. */
.landing-feature-card[data-module] {
    border-top: 3px solid;
}

.landing-feature-card[data-module="eq"]        { border-top-color: var(--module-eq); }
.landing-feature-card[data-module="multiband"] { border-top-color: var(--module-mb); }
.landing-feature-card[data-module="comp"]      { border-top-color: var(--module-comp); }
.landing-feature-card[data-module="limiter"]   { border-top-color: var(--module-lim); }
.landing-feature-card[data-module="meter"]     { border-top-color: var(--color-accent-green); }
.landing-feature-card[data-module="flow"]      { border-top-color: var(--color-accent-blue); }

.landing-feature-card:hover[data-module="eq"]        { border-color: var(--module-eq); }
.landing-feature-card:hover[data-module="multiband"] { border-color: var(--module-mb); }
.landing-feature-card:hover[data-module="comp"]      { border-color: var(--module-comp); }
.landing-feature-card:hover[data-module="limiter"]   { border-color: var(--module-lim); }

.feature-eyebrow {
    display: inline-block;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.landing-feature-card[data-module="eq"]        .feature-eyebrow { color: var(--module-eq); }
.landing-feature-card[data-module="multiband"] .feature-eyebrow { color: var(--module-mb); }
.landing-feature-card[data-module="comp"]      .feature-eyebrow { color: var(--module-comp); }
.landing-feature-card[data-module="limiter"]   .feature-eyebrow { color: var(--module-lim); }
.landing-feature-card[data-module="meter"]     .feature-eyebrow { color: var(--color-accent-green); }
.landing-feature-card[data-module="flow"]      .feature-eyebrow { color: var(--color-accent-blue); }

/* ---------------------------------------------------------------------------
   Screenshots (placeholder block)
   --------------------------------------------------------------------------- */

.screenshot-placeholder {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.screenshot-frame {
    aspect-ratio: 16 / 10;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    background:
        repeating-linear-gradient(
            45deg,
            transparent 0,
            transparent 12px,
            rgba(255, 255, 255, 0.02) 12px,
            rgba(255, 255, 255, 0.02) 24px
        ),
        var(--color-bg-tertiary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--color-text-tertiary);
}

.screenshot-frame strong {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.screenshot-frame span {
    font-size: var(--font-size-sm);
}

/* ---------------------------------------------------------------------------
   How it works (3-step)
   --------------------------------------------------------------------------- */

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-xl);
    counter-reset: step;
}

.step-card {
    position: relative;
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    top: -22px;
    left: 50%;
    transform: translateX(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-cyan);
    color: white;
    font-weight: 700;
    font-size: var(--font-size-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.step-card h3 {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.step-card p {
    color: var(--color-text-secondary);
    margin: 0;
    font-size: var(--font-size-sm);
}

/* ---------------------------------------------------------------------------
   Pricing summary (lighter than v2 .pricing-grid; links into v2 for full)
   --------------------------------------------------------------------------- */

.pricing-summary {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-lg);
    max-width: 880px;
    margin: 0 auto;
}

.pricing-summary-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.pricing-summary-card[data-tier="pro"] {
    border-color: var(--color-accent-purple);
    box-shadow: 0 0 24px rgba(168, 85, 247, 0.12);
}

.pricing-summary-card h3 {
    font-size: var(--font-size-2xl);
    margin: 0;
}

.pricing-summary-price {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.pricing-summary-card ul {
    list-style: none;
    padding: 0;
    margin: var(--spacing-sm) 0 var(--spacing-md);
}

.pricing-summary-card ul li {
    padding-left: var(--spacing-lg);
    position: relative;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.pricing-summary-card ul li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--color-accent-green);
    font-weight: 700;
}

/* ---------------------------------------------------------------------------
   Compatibility table
   --------------------------------------------------------------------------- */

.compat-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-lg);
}

.compat-card {
    padding: var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
}

.compat-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.compat-status {
    font-size: var(--font-size-xs);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 700;
}

.compat-status[data-state="full"] {
    background: rgba(34, 197, 94, 0.15);
    color: var(--color-accent-green);
}

.compat-status[data-state="planned"] {
    background: rgba(113, 113, 122, 0.2);
    color: var(--color-text-tertiary);
}

.compat-card p {
    font-size: var(--font-size-sm);
    margin: 0;
    color: var(--color-text-secondary);
}

/* ---------------------------------------------------------------------------
   Quick install
   --------------------------------------------------------------------------- */

.install-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-lg);
}

.install-card {
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.install-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.install-card ol {
    padding-left: var(--spacing-lg);
    margin: 0 0 var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.install-card .btn {
    margin-top: auto;
    align-self: flex-start;
}

/* ---------------------------------------------------------------------------
   FAQ teaser (uses native <details>/<summary>)
   --------------------------------------------------------------------------- */

.faq-teaser {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-teaser details {
    background: var(--color-bg-tertiary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-teaser summary {
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    transition: background var(--transition-fast);
}

.faq-teaser summary::-webkit-details-marker { display: none; }

.faq-teaser summary::after {
    content: "+";
    color: var(--color-accent-cyan);
    font-size: var(--font-size-xl);
    line-height: 1;
    flex-shrink: 0;
}

.faq-teaser details[open] summary::after {
    content: "\2212"; /* minus */
}

.faq-teaser summary:hover {
    background: var(--color-bg-elevated);
}

.faq-teaser details > p,
.faq-teaser details > div {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.faq-teaser-link {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

/* ---------------------------------------------------------------------------
   Final CTA
   --------------------------------------------------------------------------- */

.final-cta {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.final-cta h2 {
    margin-bottom: var(--spacing-md);
}

.final-cta p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
}

.final-cta-links {
    margin-top: var(--spacing-xl);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.final-cta-links a {
    margin: 0 var(--spacing-sm);
}

/* ---------------------------------------------------------------------------
   404 page
   --------------------------------------------------------------------------- */

.notfound {
    min-height: calc(100vh - var(--nav-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    background:
        radial-gradient(ellipse at 50% 30%, rgba(239, 68, 68, 0.10) 0%, transparent 60%),
        var(--color-bg-primary);
}

.notfound-inner {
    max-width: 560px;
}

.notfound-code {
    font-size: clamp(5rem, 12vw, 8rem);
    font-weight: 800;
    line-height: 1;
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.04em;
}

.notfound-inner h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.notfound-inner p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.notfound-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ---------------------------------------------------------------------------
   Responsive breakpoints
   --------------------------------------------------------------------------- */

@media (max-width: 968px) {
    .feature-grid-4up { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .feature-grid-3up { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .compat-grid     { grid-template-columns: 1fr; }
    .install-grid    { grid-template-columns: 1fr; }
    .steps-grid      { grid-template-columns: 1fr; gap: var(--spacing-2xl); }
    .pricing-summary { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .feature-grid-4up,
    .feature-grid-3up,
    .feature-grid-2up { grid-template-columns: 1fr; }
    .landing-section  { padding: var(--spacing-2xl) var(--spacing-md); }
    .landing-hero     { padding: var(--spacing-2xl) var(--spacing-md); }
    .cta-row          { flex-direction: column; align-items: stretch; }
    .landing-hero .btn-large { width: 100%; }
}