/* ==========================================================================
   Papyrus Labs - Institutional Design System
   Library of Alexandria meets Bodleian meets Bell Labs
   ========================================================================== */

/* ==========================================================================
   1. Design Tokens
   ========================================================================== */

:root {
    /* Neutrals - Academic Authority */
    --papyrus-charcoal: #1A1A1A;
    --papyrus-slate-900: #0F172A;
    --papyrus-slate-700: #334155;
    --papyrus-slate-500: #64748B;
    --papyrus-slate-300: #CBD5E1;
    --papyrus-slate-100: #F1F5F9;

    /* Papyrus Tones - Warmth and History */
    --papyrus-sand: #E6D5B8;
    --papyrus-ivory: #FAF7F0;
    --papyrus-aged: #D4C4A0;
    --papyrus-brown: #8B7355;
    --papyrus-white: #FFFFFF;

    /* Gold - Academic Excellence (use sparingly) */
    --papyrus-gold-500: #D4AF37;
    --papyrus-gold-600: #B8941F;
    --papyrus-gold-700: #9A7816;

    /* Lapis Lazuli - Primary Accent */
    --lapis-400: #4A7BA7;
    --lapis-500: #2C5F8D;
    --lapis-600: #1E4A6B;

    /* Research Area Colors */
    --research-code: #2C5F8D;
    --research-emotion: #6B5B95;
    --research-practical: #8B7355;
    --research-future: #475569;

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-7: 1.75rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Golden ratio spacing */
    --space-golden-xs: 1.618rem;
    --space-golden-sm: 2.618rem;
    --space-golden-md: 4.236rem;
    --space-golden-lg: 6.854rem;

    /* Layout */
    --content-max-narrow: 65ch;
    --content-max-standard: 80ch;
    --content-max-wide: 1200px;

    /* Easing */
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
}

/* ==========================================================================
   2. Reset & Base
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 6rem;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--papyrus-slate-900);
    background: var(--papyrus-ivory);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ==========================================================================
   3. Layout
   ========================================================================== */

.papyrus-container {
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

@media (min-width: 768px) {
    .papyrus-container {
        padding-left: var(--space-12);
        padding-right: var(--space-12);
    }
}

@media (min-width: 1024px) {
    .papyrus-container {
        padding-left: var(--space-20);
        padding-right: var(--space-20);
    }
}

/* ==========================================================================
   4. Skip Link
   ========================================================================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--papyrus-charcoal);
    color: var(--papyrus-white);
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

/* ==========================================================================
   5. Logo / Wordmark
   ========================================================================== */

.papyrus-logo {
    text-align: center;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--papyrus-charcoal);
    margin: 0;
}

.logo-rule {
    width: 200px;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--lapis-500) 50%,
        transparent 100%
    );
    margin: var(--space-4) auto 0;
    animation: rule-draw 600ms var(--ease-out) forwards;
}

/* Small logo variant */
.papyrus-logo.small .logo-text {
    font-size: 1.25rem;
    letter-spacing: 0.05em;
}

.papyrus-logo.small .logo-rule {
    width: 100px;
    height: 1px;
    margin-top: var(--space-2);
}

/* ==========================================================================
   6. Header
   ========================================================================== */

.papyrus-header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--papyrus-slate-300);
    padding: var(--space-6) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo {
    text-decoration: none;
}

.header-nav {
    display: flex;
    gap: var(--space-8);
    align-items: center;
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--papyrus-slate-700);
    text-decoration: none;
    transition: color 200ms ease;
    position: relative;
}

.nav-link:hover {
    color: var(--lapis-600);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--lapis-500);
    transform: scaleX(0);
    transition: transform 200ms ease;
}

.nav-link:hover::after {
    transform: scaleX(1);
}

@media (max-width: 768px) {
    .header-nav {
        gap: var(--space-4);
    }

    .nav-link {
        font-size: 0.75rem;
    }
}

/* ==========================================================================
   7. Hero Section
   ========================================================================== */

.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: var(--papyrus-ivory);
    padding-top: var(--space-golden-lg);
    padding-bottom: var(--space-golden-lg);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    animation: fade-in 800ms var(--ease-out) forwards;
}

.hero-subtitle {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--papyrus-slate-700);
    margin: var(--space-8) 0;
    font-style: italic;
}

.hero-description {
    max-width: var(--content-max-narrow);
    margin: var(--space-12) auto 0;
}

.hero-description p {
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--papyrus-slate-700);
}

@media (max-width: 768px) {
    .hero-section {
        min-height: auto;
        padding-top: var(--space-golden-sm);
        padding-bottom: var(--space-golden-sm);
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description p {
        font-size: 1rem;
    }
}

/* ==========================================================================
   8. Section Header
   ========================================================================== */

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
    color: var(--papyrus-charcoal);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin: 0;
}

.section-rule {
    width: 120px;
    height: 2px;
    background: var(--lapis-500);
    margin: var(--space-4) auto;
}

.section-subtitle {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--papyrus-slate-500);
    max-width: 60ch;
    margin: var(--space-6) auto 0;
}

.section-named {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.375rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    color: var(--lapis-600);
    margin: var(--space-4) 0 0 0;
}

@media (max-width: 768px) {
    .section-title {
        font-size: 1.5rem;
    }
}

/* ==========================================================================
   9. Work Section — the arc (shipped + in development)
   ========================================================================== */

.work-section {
    padding-top: var(--space-golden-lg);
    padding-bottom: var(--space-golden-lg);
    background: var(--papyrus-white);
}

/* Left-aligned section header variant */
.section-header--left {
    text-align: left;
    max-width: var(--content-max-wide);
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--space-16);
}

.section-header--left .section-rule {
    margin-left: 0;
    margin-right: 0;
}

.section-header--left .section-subtitle {
    margin-left: 0;
    margin-right: 0;
    max-width: 60ch;
}

/* Tier wrapper + label */
.arc-tier {
    max-width: var(--content-max-wide);
    margin: 0 auto;
}

.arc-tier--dev {
    margin-top: var(--space-golden-md);
}

.arc-tier__label {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--papyrus-slate-500);
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--papyrus-slate-300);
    margin-bottom: var(--space-10);
}

.arc-tier__marker {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    flex-shrink: 0;
}

.arc-tier__marker--live {
    background: var(--lapis-500);
    box-shadow: 0 0 0 4px rgba(44, 95, 141, 0.14);
}

.arc-tier__marker--dev {
    background: transparent;
    border: 1.5px solid var(--papyrus-aged);
}

/* Shipped entries — editorial, index + body */
.arc-entry--shipped {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding: var(--space-10) 0;
    border-top: 1px solid var(--papyrus-slate-300);
}

.arc-entry--shipped:first-of-type {
    border-top: none;
    padding-top: 0;
}

@media (min-width: 768px) {
    .arc-entry--shipped {
        grid-template-columns: 5rem 1fr;
        gap: var(--space-10);
    }
}

.arc-entry__index {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1;
    color: var(--papyrus-aged);
}

.arc-entry__head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-3) var(--space-4);
    margin-bottom: var(--space-4);
}

.arc-entry__name {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    line-height: 1;
    color: var(--papyrus-charcoal);
    margin: 0;
}

.arc-entry__name--sm {
    font-size: 1.5rem;
}

.arc-entry__myth {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.0625rem;
    color: var(--papyrus-brown);
}

.arc-entry__lede {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-style: italic;
    line-height: 1.4;
    color: var(--lapis-600);
    margin: 0 0 var(--space-4) 0;
}

.arc-entry__desc {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--papyrus-slate-700);
    max-width: 68ch;
    margin: 0;
}

.arc-entry__proof {
    list-style: none;
    margin: var(--space-6) 0 0 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-6);
}

.arc-entry__proof li {
    position: relative;
    padding-left: var(--space-4);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--papyrus-slate-700);
}

.arc-entry__proof li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 5px;
    height: 5px;
    background: var(--lapis-400);
    border-radius: 50%;
}

.arc-entry__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--lapis-600);
    transition: gap 200ms var(--ease-out), color 200ms ease;
}

.arc-entry__link:hover {
    color: var(--lapis-500);
    gap: var(--space-3);
}

/* In-development entries — quieter, two-up */
.arc-dev-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

@media (min-width: 768px) {
    .arc-dev-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-12);
    }
}

.arc-entry--dev .arc-entry__desc {
    font-size: 1rem;
    color: var(--papyrus-slate-500);
}

/* Status markers */
.status {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
}

.status--live {
    background: var(--lapis-500);
    color: var(--papyrus-white);
}

.status--dev {
    background: transparent;
    color: var(--papyrus-slate-500);
    border: 1px solid var(--papyrus-slate-300);
}

/* ==========================================================================
   10. Philosophy Section
   ========================================================================== */

.philosophy-section {
    background: var(--papyrus-sand);
    padding-top: var(--space-golden-lg);
    padding-bottom: var(--space-golden-lg);
}

.philosophy-content {
    max-width: 70ch;
    margin: 0 auto;
    text-align: center;
}

.philosophy-paragraph {
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--papyrus-brown);
    margin: 0 0 var(--space-8) 0;
}

.philosophy-paragraph--lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--papyrus-charcoal);
}

.philosophy-paragraph:last-child {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .philosophy-section {
        padding-top: var(--space-golden-sm);
        padding-bottom: var(--space-golden-sm);
    }

    .philosophy-paragraph {
        font-size: 1rem;
        text-align: left;
    }

    .philosophy-paragraph--lead {
        font-size: 1.125rem;
    }
}

/* ==========================================================================
   11. Footer
   ========================================================================== */

.papyrus-footer {
    background: var(--papyrus-ivory);
    padding: var(--space-golden-md) 0 var(--space-12) 0;
    border-top: 1px solid var(--papyrus-aged);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.footer-description {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--papyrus-slate-700);
    margin: var(--space-8) 0;
}

.footer-meta {
    margin: var(--space-6) 0;
}

.footer-location,
.footer-affiliation {
    font-family: var(--font-body);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--papyrus-slate-500);
    margin: var(--space-2) 0;
}

.footer-affiliation {
    font-style: italic;
}

.footer-rule {
    width: 200px;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--lapis-600) 50%,
        transparent 100%
    );
    margin: var(--space-8) auto;
}

.footer-copyright {
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--papyrus-slate-500);
    margin: 0;
}

@media (max-width: 768px) {
    .papyrus-footer {
        padding-top: var(--space-golden-sm);
    }
}

/* ==========================================================================
   12. Animations
   ========================================================================== */

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rule-draw {
    from {
        transform: scaleX(0);
    }
    to {
        transform: scaleX(1);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================================================
   13. Focus States
   ========================================================================== */

*:focus-visible {
    outline: 2px solid var(--lapis-500);
    outline-offset: 4px;
}

/* ==========================================================================
   14. Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 1;
    padding: var(--space-4) var(--space-8);
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: background 200ms ease, transform 200ms var(--ease-out), box-shadow 200ms ease;
}

.btn--primary {
    background: var(--lapis-500);
    color: var(--papyrus-white);
}

.btn--primary:hover {
    background: var(--lapis-400);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(30, 74, 107, 0.28);
}

.btn--ghost {
    background: transparent;
    color: var(--lapis-600);
    border-color: var(--papyrus-slate-300);
}

.btn--ghost:hover {
    border-color: var(--lapis-500);
    background: rgba(44, 95, 141, 0.05);
}

/* ==========================================================================
   15. Hero proof line + accent nav
   ========================================================================== */

.hero-proof {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-10);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
    color: var(--papyrus-slate-500);
}

.hero-proof__sep {
    color: var(--papyrus-aged);
}

.nav-link--accent {
    color: var(--lapis-600);
    font-weight: 600;
}

.nav-link--accent:hover {
    color: var(--lapis-500);
}

/* ==========================================================================
   16. Invite band — bridge to /train
   ========================================================================== */

.invite-section {
    background: var(--papyrus-slate-900);
    padding-top: var(--space-golden-md);
    padding-bottom: var(--space-golden-md);
}

.invite-content {
    max-width: 60ch;
    margin: 0 auto;
    text-align: center;
}

.invite-rule {
    width: 120px;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--lapis-400) 50%,
        transparent 100%
    );
    margin: 0 auto var(--space-8);
}

.invite-heading {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 500;
    line-height: 1.2;
    color: var(--papyrus-ivory);
    margin: 0 0 var(--space-6) 0;
}

.invite-body {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--papyrus-slate-300);
    margin: 0 0 var(--space-10) 0;
}

.invite-cta {
    font-size: 1.0625rem;
}

@media (max-width: 768px) {
    .invite-heading {
        font-size: 1.75rem;
    }
}

/* ==========================================================================
   17. Funnel — /train (plain voice, committed lapis, mobile-first)
   ========================================================================== */

.train-body {
    background: var(--papyrus-ivory);
}

.train-shell {
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding-left: var(--space-5);
    padding-right: var(--space-5);
}

@media (min-width: 768px) {
    .train-shell {
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }
}

/* Header */
.train-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 247, 240, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--papyrus-aged);
}

.train-header .train-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-4);
    padding-bottom: var(--space-4);
}

.train-brand__mark {
    font-family: var(--font-display);
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--papyrus-charcoal);
}

.train-header__cta {
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--lapis-600);
}

.train-header__cta:hover {
    color: var(--lapis-500);
}

/* Hero */
.train-hero {
    padding-top: var(--space-golden-md);
    padding-bottom: var(--space-golden-md);
    text-align: center;
}

.train-kicker {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--lapis-500);
    margin: 0 0 var(--space-5) 0;
}

.train-h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 9vw, 4rem);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.01em;
    color: var(--papyrus-charcoal);
    margin: 0 0 var(--space-6) 0;
}

.train-lede {
    font-family: var(--font-body);
    font-size: 1.1875rem;
    line-height: 1.7;
    color: var(--papyrus-slate-700);
    max-width: 38ch;
    margin: 0 auto var(--space-10);
}

.train-lede em {
    font-style: italic;
    color: var(--papyrus-charcoal);
}

.train-hero__cta {
    width: 100%;
    max-width: 22rem;
    padding-top: var(--space-5);
    padding-bottom: var(--space-5);
}

.train-hero__meta {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--papyrus-slate-500);
    margin: var(--space-5) 0 0 0;
}

/* Section type */
.train-h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 5vw, 2.25rem);
    font-weight: 600;
    line-height: 1.15;
    color: var(--papyrus-charcoal);
    margin: 0 0 var(--space-8) 0;
}

.train-h2--center {
    text-align: center;
    margin-bottom: var(--space-3);
}

/* Value */
.train-value {
    padding-top: var(--space-golden-sm);
    padding-bottom: var(--space-golden-sm);
    background: var(--papyrus-white);
    border-top: 1px solid var(--papyrus-aged);
    border-bottom: 1px solid var(--papyrus-aged);
}

.train-points {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-6);
}

.train-points li {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--papyrus-slate-700);
    padding-left: var(--space-6);
    position: relative;
}

.train-points li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--lapis-500);
}

.train-points__k {
    display: block;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--papyrus-charcoal);
    margin-bottom: var(--space-1);
}

/* Pricing */
.train-pricing {
    padding-top: var(--space-golden-md);
    padding-bottom: var(--space-golden-md);
}

.train-pricing__sub {
    text-align: center;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--papyrus-slate-500);
    margin: 0 0 var(--space-10) 0;
}

.tiers {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--space-5);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 820px) {
    .tiers {
        grid-template-columns: repeat(3, 1fr);
        align-items: stretch;
        gap: var(--space-5);
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }
}

.tier {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--papyrus-white);
    border: 1px solid var(--papyrus-slate-300);
    border-radius: 12px;
    padding: var(--space-8) var(--space-6);
}

.tier--featured {
    border-color: var(--lapis-500);
    border-width: 1.5px;
    box-shadow: 0 12px 32px rgba(30, 74, 107, 0.12);
}

.tier__flag {
    position: absolute;
    top: 0;
    right: var(--space-6);
    transform: translateY(-50%);
    background: var(--lapis-500);
    color: var(--papyrus-white);
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
}

.tier__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.tier__name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--papyrus-charcoal);
    margin: 0;
}

.tier__price {
    text-align: right;
    line-height: 1;
}

.tier__amt {
    display: block;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--lapis-600);
}

.tier__unit {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--papyrus-slate-500);
}

.tier__desc {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--papyrus-slate-700);
    margin: 0 0 var(--space-8) 0;
    flex-grow: 1;
}

.tier__cta {
    width: 100%;
    padding-top: var(--space-5);
    padding-bottom: var(--space-5);
}

.train-guarantee {
    text-align: center;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--papyrus-brown);
    margin: var(--space-10) auto 0;
    max-width: 44ch;
}

/* How it works */
.train-how {
    padding-top: var(--space-golden-sm);
    padding-bottom: var(--space-golden-md);
    background: var(--papyrus-white);
    border-top: 1px solid var(--papyrus-aged);
}

.steps {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-8);
}

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--space-5);
}

.step__n {
    flex-shrink: 0;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1.5px solid var(--lapis-500);
    color: var(--lapis-600);
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 500;
}

.step__h {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--papyrus-charcoal);
    margin: 0 0 var(--space-1) 0;
}

.step__p {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--papyrus-slate-700);
    margin: 0;
}

/* Trust */
.train-trust {
    padding-top: var(--space-golden-md);
    padding-bottom: var(--space-golden-md);
    background: var(--papyrus-sand);
}

.train-trust__lede {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--papyrus-brown);
    margin: 0 0 var(--space-4) 0;
}

.train-trust__body {
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 3.5vw, 1.625rem);
    font-weight: 500;
    line-height: 1.5;
    color: var(--papyrus-charcoal);
    margin: 0;
}

.train-trust__body a {
    color: var(--lapis-600);
    text-decoration: underline;
    text-decoration-color: var(--lapis-400);
    text-underline-offset: 3px;
}

/* FAQ */
.train-faq {
    padding-top: var(--space-golden-md);
    padding-bottom: var(--space-golden-md);
}

.faq {
    display: grid;
    gap: 0;
}

.faq__item {
    border-top: 1px solid var(--papyrus-slate-300);
    padding: var(--space-5) 0;
}

.faq__item:last-child {
    border-bottom: 1px solid var(--papyrus-slate-300);
}

.faq__q {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--papyrus-charcoal);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.faq__q::-webkit-details-marker {
    display: none;
}

.faq__q::after {
    content: '+';
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--lapis-500);
    font-size: 1.5rem;
    line-height: 1;
    transition: transform 200ms var(--ease-out);
}

.faq__item[open] .faq__q::after {
    transform: rotate(45deg);
}

.faq__a {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--papyrus-slate-700);
    margin: var(--space-4) 0 0 0;
    max-width: 58ch;
}

/* Final CTA */
.train-final {
    padding-top: var(--space-golden-md);
    padding-bottom: var(--space-golden-md);
    background: var(--papyrus-slate-900);
    text-align: center;
}

.train-final__h {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 500;
    line-height: 1.2;
    color: var(--papyrus-ivory);
    margin: 0 0 var(--space-8) 0;
}

.train-final__cta {
    width: 100%;
    max-width: 22rem;
    padding-top: var(--space-5);
    padding-bottom: var(--space-5);
}

/* Footer */
.train-footer {
    padding-top: var(--space-10);
    padding-bottom: var(--space-10);
    background: var(--papyrus-ivory);
    text-align: center;
}

.train-footer__mark {
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--papyrus-slate-700);
}

.train-footer__links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4) var(--space-6);
    margin: var(--space-5) 0;
}

.train-footer__links a {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--lapis-600);
}

.train-footer__links a:hover {
    color: var(--lapis-500);
}

.train-footer__copy {
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--papyrus-slate-500);
    margin: 0;
}