/* ===================================
   DESIGN SYSTEM
   =================================== */

:root {
    /* Colors */
    --bg-primary: #0A0A0A;
    --bg-secondary: #111111;
    --bg-card: #1A1A1A;
    --border-color: #2A2A2A;
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0A0;
    --text-tertiary: #6B6B6B;
    --accent-primary: #F59E0B;
    --accent-hover: #FBBF24;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --section-padding: 120px;
    --section-padding-mobile: 60px;
    --container-max-width: 1200px;
    --text-max-width: 700px;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: var(--section-padding) 0;
}

.section-header {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 48px;
    text-align: center;
}

/* ===================================
   STICKY HEADER
   =================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 24px;
    background: linear-gradient(to bottom, rgba(10, 10, 10, 0.95) 0%, rgba(10, 10, 10, 0) 100%);
    transition: background 0.3s ease;
}

.site-header.scrolled {
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.header-cta {
    padding: 10px 20px;
    background-color: transparent;
    color: var(--accent-primary);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--accent-primary);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.header-cta:hover {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background-color: var(--bg-primary);
    text-align: center;
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease;
}

.hero-headline {
    font-size: 80px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-subhead {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

/* Hero email form */
.hero-email-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto 40px;
    gap: 8px;
}

.hero-email-form input[type="email"] {
    flex: 1;
    padding: 16px 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: var(--font-family);
    transition: all 0.2s ease;
}

.hero-email-form input[type="email"]::placeholder {
    color: var(--text-tertiary);
}

.hero-email-form input[type="email"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: rgba(245, 158, 11, 0.05);
}

.hero-email-form button {
    padding: 16px 32px;
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.hero-email-form button:hover {
    background-color: var(--accent-hover);
    transform: scale(1.02);
}

.hero-email-form button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.cta-button {
    display: inline-block;
    padding: 16px 40px;
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.cta-button:hover {
    background-color: var(--accent-hover);
    transform: scale(1.02);
}

/* Anti-pitch badges */
.anti-pitch {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.anti-badge {
    padding: 8px 16px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Hero stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--text-tertiary);
    margin-top: 4px;
}

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

/* ===================================
   PROBLEM SECTION
   =================================== */

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

.problem-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.problem-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    transition: all 0.3s ease;
}

.problem-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.problem-icon {
    color: var(--accent-primary);
    margin-bottom: 16px;
}

.problem-card p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===================================
   MODEL SECTION
   =================================== */

.model-section {
    background-color: var(--bg-primary);
}

.model-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr;
    gap: 40px;
    align-items: start;
    max-width: 1100px;
    margin: 0 auto;
}

.model-column {
    text-align: center;
}

.model-header {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
}

.model-header.accent {
    color: var(--accent-primary);
}

.model-header.gradient {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--text-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.model-list {
    list-style: none;
    text-align: center;
}

.model-list li {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.model-connector {
    font-size: 32px;
    color: var(--accent-primary);
    font-weight: 600;
    align-self: center;
    margin-top: 40px;
}

.model-keyline {
    margin-top: 64px;
    font-size: 28px;
    font-style: italic;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-primary);
    font-weight: 500;
}

/* ===================================
   HOW IT WORKS SECTION
   =================================== */

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

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline-line {
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--accent-primary);
}

.timeline-step {
    display: flex;
    gap: 32px;
    margin-bottom: 48px;
    position: relative;
}

.timeline-node {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    flex-shrink: 0;
    z-index: 1;
}

.timeline-content {
    flex: 1;
    padding-top: 8px;
}

.timeline-content h3 {
    font-size: 24px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.timeline-badge {
    display: inline-block;
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.timeline-content ul {
    list-style: none;
    margin: 0;
}

.timeline-content li {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    padding-left: 24px;
    position: relative;
}

.timeline-content li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* ===================================
   PARTNERS SECTION
   =================================== */

.partners-section {
    background-color: var(--bg-primary);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto 40px;
}

.partner-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 40px;
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

.partner-card.b2b {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, var(--bg-card) 100%);
}

.partner-card.b2c {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.05) 0%, var(--bg-card) 100%);
}

.partner-card h3 {
    font-size: 32px;
    margin-bottom: 24px;
}

.partner-card ul {
    list-style: none;
    margin-bottom: 24px;
}

.partner-card li {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-left: 28px;
    position: relative;
}

.partner-card li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 700;
}

.partner-card .examples {
    font-size: 14px;
    color: var(--text-tertiary);
    font-style: italic;
}

.selectivity-note {
    text-align: center;
    font-size: 18px;
    color: var(--accent-primary);
    font-weight: 600;
}

/* Mid-page CTA */
.mid-cta {
    text-align: center;
    margin-top: 48px;
}

/* ===================================
   EQUITY SECTION
   =================================== */

.equity-section {
    background-color: var(--bg-secondary);
    text-align: center;
}

.equity-icon {
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.equity-list {
    list-style: none;
    max-width: var(--text-max-width);
    margin: 0 auto 48px;
}

.equity-list li {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    padding-left: 32px;
    position: relative;
    text-align: left;
}

.equity-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 700;
}

.trust-builder {
    max-width: 600px;
    margin: 0 auto;
    padding: 32px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    position: relative;
}

.trust-builder p {
    font-size: 24px;
    color: var(--text-primary);
    font-style: italic;
    margin: 0;
}

.trust-builder:before {
    content: """;
    position: absolute;
    top: -20px;
    left: 24px;
    font-size: 64px;
    color: var(--accent-primary);
    line-height: 1;
}

/* ===================================
   CREDIBILITY SECTION
   =================================== */

.credibility-section {
    background-color: var(--bg-primary);
    text-align: center;
}

.founder-bio {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: var(--text-max-width);
    margin: 0 auto 32px;
    line-height: 1.7;
}

.founder-quote {
    font-size: 20px;
    font-style: italic;
    color: var(--text-primary);
    max-width: 600px;
    margin: 0 auto 48px;
    position: relative;
}

.founder-quote:before,
.founder-quote:after {
    content: '"';
    color: var(--accent-primary);
    font-size: 24px;
}

.logo-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: 32px;
}

.logo-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.company-logo {
    height: 40px;
    width: auto;
    filter: grayscale(100%) brightness(0.7);
    transition: filter 0.3s ease;
    object-fit: contain;
}

.company-logo:hover {
    filter: grayscale(0%) brightness(1);
}

/* Sequoia text logo */
.sequoia-text {
    height: 40px;
    display: flex;
    align-items: center;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: #888;
    transition: color 0.3s ease;
    font-family: var(--font-family);
}

.sequoia-text:hover {
    color: #fff;
}

/* ===================================
   FAQ SECTION
   =================================== */

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

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 18px;
    color: var(--text-primary);
    font-weight: 500;
    user-select: none;
}

.faq-icon {
    color: var(--accent-primary);
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    margin-top: 16px;
}

.faq-answer p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===================================
   APPLICATION SECTION
   =================================== */

.apply-section {
    background: radial-gradient(circle at center, rgba(245, 158, 11, 0.05) 0%, var(--bg-primary) 70%);
    text-align: center;
}

.apply-subhead {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
}

/* Trust signals above form */
.form-trust-signals {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.trust-signal {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.trust-signal svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.application-form {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    max-width: 500px;
    margin: 0 auto;
    text-align: left;
}

/* Multi-step form progress */
.form-progress {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
    gap: 16px;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0.4;
    transition: opacity 0.3s ease;
}

.progress-step.active {
    opacity: 1;
}

.progress-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 16px;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.progress-step.active .progress-circle {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

.progress-step.completed .progress-circle {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

.progress-step span {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 500;
}

.progress-step.active span {
    color: var(--text-secondary);
}

.progress-line {
    width: 60px;
    height: 2px;
    background-color: var(--border-color);
    margin-bottom: 24px;
}

/* Form steps */
.form-step {
    display: none;
}

.form-step.active {
    display: block;
    animation: fadeInSlide 0.3s ease;
}

.step-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    text-align: center;
}

.step-description {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    text-align: center;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.back-button {
    flex: 1;
    padding: 16px;
    background-color: transparent;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.back-button:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.form-actions .submit-button {
    flex: 2;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: var(--font-family);
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.submit-button {
    width: 100%;
    padding: 16px;
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    font-size: 16px;
    font-weight: 700;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.submit-button:hover {
    background-color: var(--accent-hover);
    transform: scale(1.02);
}

.submit-button:active {
    transform: scale(0.98);
}

.form-privacy {
    text-align: center;
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 16px;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .hero-headline {
        font-size: 36px;
        line-height: 1.2;
    }

    .hero-subhead {
        font-size: 16px;
        padding: 0 16px;
    }

    .hero-email-form {
        flex-direction: column;
        gap: 12px;
        padding: 0 16px;
        max-width: 100%;
    }

    .hero-email-form button {
        width: 100%;
    }

    .anti-pitch {
        gap: 8px;
        padding: 0 16px;
    }

    .anti-badge {
        font-size: 11px;
        padding: 6px 12px;
    }

    .section-header {
        font-size: 36px;
        margin-bottom: 32px;
    }

    .problem-grid {
        grid-template-columns: 1fr;
    }

    .model-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .model-connector {
        display: none;
    }

    .model-keyline {
        font-size: 20px;
        margin-top: 32px;
    }

    .timeline-line {
        left: 20px;
    }

    .timeline-node {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .timeline-step {
        gap: 24px;
    }

    .timeline-content h3 {
        font-size: 20px;
    }

    .partners-grid {
        grid-template-columns: 1fr;
    }

    .partner-card {
        min-height: auto;
    }

    .logo-bar {
        gap: 24px;
        flex-wrap: wrap;
        justify-content: center;
        padding: 20px 16px;
    }

    .company-logo {
        height: 24px;
    }

    .sequoia-text {
        font-size: 11px;
        height: 24px;
    }

    .logo-label {
        font-size: 12px;
        padding: 0 16px;
    }

    .application-form {
        padding: 32px 24px;
    }

    .trust-builder p {
        font-size: 20px;
    }

    .hero-stats {
        flex-direction: row;
        gap: 32px;
    }

    .stat-number {
        font-size: 28px;
    }

    .form-trust-signals {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .site-header {
        padding: 12px 16px;
    }

    .logo {
        font-size: 16px;
    }

    .header-cta {
        padding: 8px 14px;
        font-size: 12px;
    }

    .hero-headline {
        font-size: 32px;
    }

    .section-header {
        font-size: 24px;
    }

    .container {
        padding: 0 16px;
    }

    .anti-pitch {
        gap: 8px;
    }

    .anti-badge {
        font-size: 10px;
        padding: 5px 10px;
    }

    .hero-stats {
        flex-direction: row;
        gap: 24px;
        margin-top: 40px;
        padding-top: 24px;
    }

    .stat-number {
        font-size: 24px;
    }

    .stat-label {
        font-size: 11px;
    }

    .founder-bio {
        font-size: 14px;
        line-height: 1.6;
        padding: 0 8px;
    }

    .founder-quote {
        font-size: 16px;
        padding: 0 8px;
    }
}

/* ===================================
   FOOTER
   =================================== */

.site-footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 60px 0;
    text-align: center;
}

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

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.footer-tagline {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.footer-copyright {
    font-size: 14px;
    color: var(--text-tertiary);
}