/* ============================================
   CSS Variables — Theme
   ============================================ */

:root {
    --color-bg:         #F5F7FA;
    --color-surface:    #FFFFFF;
    --color-primary:    #0D1F38;
    --color-accent:     #C8E0FF;
    --color-muted:      #94A3B8;
    --color-text:       #1E293B;
    --color-hero-bg:    #0D1F38;
    --color-hero-text:  #FFFFFF;
    --color-hero-muted: rgba(255,255,255,0.55);
    --font-heading:     'Fraunces', serif;
    --font-body:        'Inter', sans-serif;
    --heading-weight:   700;
    --color-footer-bg:  #162338;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
    opacity: 0;
}

html.ready {
    opacity: 1;
    transition: opacity 0.9s ease-in-out;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color 0.55s ease, color 0.55s ease;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--heading-weight);
    line-height: 1.15;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

/* ============================================
   Container
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    background-color: var(--color-hero-bg);
    border-bottom: 1px solid rgba(255,255,255,0.07);
    padding: 1.125rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.55s ease;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: var(--heading-weight);
    color: var(--color-hero-text);
    text-decoration: none;
    letter-spacing: -0.01em;
    transition: opacity 0.2s ease;
}

.logo:hover { opacity: 0.7; }

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.25rem;
}

.nav-links a {
    font-family: var(--font-body);
    color: var(--color-hero-text);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    opacity: 0.5;
    transition: opacity 0.2s ease;
    position: relative;
}

.nav-links a:hover { opacity: 0.85; }

.nav-links a.active {
    opacity: 1;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-accent);
    border-radius: 2px;
}

/* ============================================
   Hero Section — always dark
   ============================================ */

.hero {
    padding: 5rem 0 4.5rem;
    background-color: var(--color-hero-bg);
    transition: background-color 0.55s ease;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: var(--heading-weight);
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--color-hero-text);
    margin-bottom: 1.25rem;
}

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

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.175rem);
    color: var(--color-hero-muted);
    line-height: 1.75;
}

.hero-ctas {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.875rem;
    margin-top: 0.5rem;
}

.hero-ctas-primary {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.hero .btn-primary {
    background-color: var(--color-hero-text);
    color: var(--color-hero-bg);
    border-color: transparent;
}

.hero .btn-primary:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(0,0,0,0.2);
}

.hero .btn-secondary {
    background-color: transparent;
    color: var(--color-hero-muted);
    border: 1px solid rgba(255,255,255,0.2);
}

.hero .btn-secondary:hover {
    background-color: rgba(255,255,255,0.08);
    color: var(--color-hero-text);
    transform: translateY(-2px);
}

.hero-link-tertiary {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--color-hero-muted);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 500;
    transition: color 0.2s ease;
}

.hero-link-tertiary:hover { color: var(--color-hero-text); }

/* ============================================
   Buttons (body sections)
   ============================================ */

.btn {
    display: inline-block;
    padding: 0.8125rem 1.875rem;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-body);
    text-decoration: none;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
    transition: background-color 0.2s ease, color 0.2s ease,
                transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(0,0,0,0.12);
}

.btn-secondary {
    background-color: var(--color-accent);
    color: var(--color-primary);
}

.btn-secondary:hover {
    filter: brightness(0.92);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(0,0,0,0.1);
}

.cta-link {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-hero-text);
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-thickness: 1.5px;
    transition: opacity 0.2s ease;
}

.cta-link:hover {
    opacity: 0.7;
}

/* ============================================
   Sections
   ============================================ */

.section {
    padding: 5rem 0;
    transition: background-color 0.55s ease;
}

.section-neutral { background-color: var(--color-bg); }
.section-alt      { background-color: var(--color-surface); }

/* ============================================
   Two-column layout
   ============================================ */

.section-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3rem;
    align-items: center;
}

.section-layout-reverse {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
}

.section-col { min-width: 0; }

.section-col-text {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.section-col-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ============================================
   Single-column layout (no visual)
   ============================================ */

.section-single-col {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
}

.section-single-col .section-title  { text-align: center; }
.section-single-col .section-intro  { text-align: center; }

.section-single-col .problem-list,
.section-single-col .value-list {
    text-align: left;
    margin: 0 auto;
    display: inline-block;
    width: 100%;
}

.section-single-col .btn { margin-top: 0.5rem; }

/* ============================================
   Section Typography
   ============================================ */

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: var(--heading-weight);
    margin-bottom: 1.25rem;
    color: var(--color-primary);
}

.section-intro {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 1.25rem;
    opacity: 0.8;
}

.section-text {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text);
}

.section-text + .section-text { margin-top: 1rem; }

.section-text-note {
    font-size: 0.9375rem;
    opacity: 0.65;
    margin-top: 2rem;
    text-align: center;
    font-family: var(--font-body);
}

.highlight {
    color: var(--color-primary);
    font-weight: 600;
}

/* ============================================
   Lists
   ============================================ */

.problem-list,
.value-list,
.feature-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.problem-list li,
.value-list li,
.feature-list li {
    padding: 0.35rem 0;
    padding-left: 1.75rem;
    position: relative;
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--color-text);
}

.problem-list li::before,
.value-list li::before,
.feature-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 1.25rem;
    line-height: 1.2;
}

/* ============================================
   Visual Placeholders
   ============================================ */

.visual-placeholder {
    position: relative;
    width: 100%;
    max-width: 420px;
    aspect-ratio: 4 / 3;
    border-radius: 20px;
    background-color: var(--color-surface);
    border: 1px solid rgba(128,128,128,0.15);
    box-shadow: 0 8px 28px rgba(0,0,0,0.07);
    overflow: hidden;
}

.visual-placeholder::before {
    content: '';
    position: absolute;
    inset: 12%;
    border-radius: 14px;
    border: 1px solid rgba(128,128,128,0.1);
}

.visual-placeholder::after {
    content: '';
    position: absolute;
    width: 88px;
    height: 88px;
    border-radius: 50%;
    bottom: -20px;
    right: -12px;
    background-color: var(--color-accent);
    opacity: 0.2;
}

.hero .visual-placeholder {
    background-color: rgba(255,255,255,0.04);
    border-color: rgba(255,255,255,0.08);
    box-shadow: none;
}

.hero .visual-placeholder::before {
    border-color: rgba(255,255,255,0.07);
}

.hero-visual {
    width: 100%;
    max-width: 560px;
    display: block;
}

.section-visual {
    width: 100%;
    max-width: 480px;
    display: block;
}

/* ============================================
   Cards
   ============================================ */

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
    margin-top: 2.5rem;
}

.platform-card {
    background-color: var(--color-surface);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(128,128,128,0.12);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
}

.platform-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.75rem;
    margin-top: 2.5rem;
}

.audience-card {
    background-color: var(--color-surface);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(128,128,128,0.12);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
}

.audience-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.audience-card .btn {
    margin-top: auto;
    align-self: flex-start;
    width: auto;
    min-width: 0;
    text-align: center;
    padding: 0.6875rem 1.5rem;
}

.platform-card .btn {
    margin-top: auto;
    align-self: flex-start;
    padding-top: 1.5rem;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: var(--heading-weight);
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

.card-text {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
    color: var(--color-text);
    opacity: 0.85;
    flex: 1;
}

.platform-card .feature-list {
    margin-bottom: 1.25rem;
    flex: 1;
}

.link-arrow {
    font-family: var(--font-body);
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: color 0.2s ease;
    margin-top: auto;
    padding-top: 1.25rem;
}

.link-arrow::after { content: '→'; transition: transform 0.2s ease; }
.link-arrow:hover { color: var(--color-accent); }
.link-arrow:hover::after { transform: translateX(4px); }

.section-audience-intro {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

/* ============================================
   Content block
   ============================================ */

.content-block { max-width: 680px; }
.content-block .section-text + .section-text { margin-top: 1rem; }
.content-block .btn { margin-top: 1.75rem; }

/* ============================================
   CTA buttons group
   ============================================ */

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

/* ============================================
   CTA Section
   ============================================ */

.section-cta {
    background-color: var(--color-primary);
    padding: 5rem 0;
    transition: background-color 0.55s ease;
}

.section-cta .section-title,
.section-cta .section-text { color: #fff; }

.section-cta .btn-primary {
    background-color: #fff;
    color: var(--color-primary);
}

.section-cta .btn-primary:hover {
    background-color: var(--color-bg);
    color: var(--color-primary);
}

.section-cta .btn-secondary {
    background-color: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.4);
}

.section-cta .btn-secondary:hover {
    background-color: #fff;
    color: var(--color-primary);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background-color: var(--color-footer-bg);
    color: #fff;
    padding: 3rem 0 1.5rem;
    transition: background-color 0.55s ease;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: var(--heading-weight);
    margin-bottom: 0.5rem;
    color: #fff;
}

.footer-tagline {
    font-family: var(--font-body);
    opacity: 0.55;
    font-size: 0.9rem;
}

.footer-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-nav a {
    font-family: var(--font-body);
    color: #fff;
    text-decoration: none;
    opacity: 0.55;
    font-size: 0.9375rem;
    transition: opacity 0.2s ease;
}

.footer-nav a:hover { opacity: 1; }

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.45;
    font-size: 0.875rem;
    font-family: var(--font-body);
}

/* ============================================
   Modal
   ============================================ */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 200;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
}

.modal-overlay.modal-open {
    display: flex;
}

.modal {
    background-color: var(--color-surface);
    border-radius: 16px;
    padding: 2.5rem;
    max-width: 480px;
    width: 100%;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    background: none;
    border: none;
    font-size: 1.75rem;
    color: var(--color-text);
    cursor: pointer;
    opacity: 0.4;
    transition: opacity 0.2s ease;
    line-height: 1;
}

.modal-close:hover {
    opacity: 1;
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: var(--heading-weight);
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.modal-subtitle {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--color-text);
    opacity: 0.7;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.modal-form input,
.modal-form select {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(128, 128, 128, 0.2);
    border-radius: 8px;
    background-color: var(--color-bg);
    color: var(--color-text);
    outline: none;
    transition: border-color 0.2s ease;
    width: 100%;
}

.modal-form input:focus,
.modal-form select:focus {
    border-color: var(--color-accent);
}

.modal-form input::placeholder {
    color: var(--color-text);
    opacity: 0.4;
}

.modal-form select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394A3B8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.modal-submit {
    margin-top: 0.5rem;
    width: 100%;
}

#modalThankYou {
    text-align: center;
    padding: 1rem 0;
}

#modalThankYou .btn {
    margin-top: 1rem;
}

.chooser-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.chooser-btn {
    width: 100%;
}

/* ============================================
   Responsive
   ============================================ */

@media (min-width: 1024px) {
    .platform-grid { grid-template-columns: repeat(2, 1fr); }
    .audience-grid  { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
    .container { padding: 0 1.25rem; }
    .nav { flex-wrap: wrap; }
    .nav-links { gap: 1.25rem; }
    .section { padding: 3.5rem 0; }
    .hero     { padding: 3.5rem 0 3rem; }

    .section-layout,
    .section-layout-reverse { grid-template-columns: 1fr; }
    .section-col-visual { order: -1; }

    .hero-ctas,
    .cta-buttons { flex-direction: column; width: 100%; }

    .hero-ctas .btn,
    .cta-buttons .btn { width: 100%; text-align: center; }

    .platform-grid,
    .audience-grid { grid-template-columns: 1fr; }

    .section-single-col { text-align: left; }
    .section-single-col .section-title,
    .section-single-col .section-intro { text-align: left; }

    .modal { padding: 2rem 1.5rem; }

}