/* ============================================================
   NS Mart Presentation Website — Styles
   ============================================================ */

/* --- CSS Custom Properties / Design Tokens --- */
:root {
    /* Brand Colors */
    --orange-50: #FFF7ED;
    --orange-100: #FFEDD5;
    --orange-200: #FED7AA;
    --orange-300: #FDBA74;
    --orange-400: #FB923C;
    --orange-500: #F97316;
    --orange-600: #EA580C;
    --orange-700: #C2410C;

    /* Neutral Palette */
    --white: #FFFFFF;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #E5E5E5;
    --gray-300: #D4D4D4;
    --gray-400: #A3A3A3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    --gray-950: #0A0A0A;

    /* Chapter Colors */
    --customer-color: #F97316;
    --restaurant-color: #10B981;
    --rider-color: #06B6D4;
    --admin-color: #8B5CF6;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* Sizing */
    --container-max: 1200px;
    --container-padding: 24px;
    --nav-height: 72px;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 28px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    font-size: inherit;
}

/* Focus visible */
:focus-visible {
    outline: 2px solid var(--orange-500);
    outline-offset: 2px;
    border-radius: 4px;
}

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

/* --- Container --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================================
   PROGRESS BAR
   ============================================================ */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
    z-index: 1001;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--orange-500), var(--orange-400));
    transition: width 100ms ease;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    z-index: 1000;
    transition: transform var(--transition-base), background var(--transition-base);
}

.nav.nav-hidden {
    transform: translateY(-100%);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.nav-logo-img {
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-sm);
    object-fit: cover;
}

.nav-logo-text {
    font-weight: 700;
    font-size: 18px;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    border-radius: var(--border-radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
    color: var(--gray-800);
    background: var(--gray-100);
}

.nav-link.active {
    color: var(--orange-600);
    background: var(--orange-50);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-presentation {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: var(--gray-900);
    color: var(--white);
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-presentation:hover {
    background: var(--gray-700);
    transform: translateY(-1px);
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-hamburger.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
}
.nav-hamburger.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.mobile-nav-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.mobile-nav-content {
    display: flex;
    flex-direction: column;
    padding: 32px var(--container-padding);
    gap: 4px;
}

.mobile-nav-link {
    padding: 16px 20px;
    font-size: 18px;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: var(--border-radius-md);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-nav-link:hover {
    background: var(--orange-50);
    color: var(--orange-600);
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }
    .nav-hamburger {
        display: flex;
    }
    .mobile-nav-overlay {
        display: block;
    }
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: calc(var(--nav-height) + 40px) var(--container-padding) 60px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--white) 0%, var(--orange-50) 50%, var(--white) 100%);
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(249, 115, 22, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(249, 115, 22, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 60% 80%, rgba(249, 115, 22, 0.03) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--orange-100);
    color: var(--orange-700);
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 24px;
    letter-spacing: 0.02em;
}

.hero-logo {
    width: 80px;
    height: 80px;
    border-radius: var(--border-radius-lg);
    margin-bottom: 20px;
    box-shadow: var(--shadow-lg);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(48px, 6vw, 80px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.hero-title-ns {
    color: var(--gray-900);
}

.hero-title-mart {
    color: var(--orange-500);
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: 16px;
}

.hero-description {
    font-size: 16px;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 500px;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--orange-500);
    color: var(--white);
    font-size: 15px;
    font-weight: 600;
    border-radius: 100px;
    box-shadow: 0 4px 16px rgba(249, 115, 22, 0.3);
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
    background: var(--orange-600);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(249, 115, 22, 0.35);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--white);
    color: var(--gray-700);
    font-size: 15px;
    font-weight: 600;
    border-radius: 100px;
    border: 1px solid var(--gray-200);
    transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
    transform: translateY(-2px);
}

/* Hero Screenshots */
.hero-screenshots {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 500px;
}

.hero-phone {
    position: absolute;
    transition: transform var(--transition-smooth);
}

.hero-phone .phone-frame {
    width: 220px;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(0,0,0,0.08);
    background: var(--white);
}

.hero-phone .phone-frame img {
    width: 100%;
    height: auto;
}

.hero-phone-1 {
    z-index: 3;
    transform: translateX(0) rotate(-2deg);
}

.hero-phone-2 {
    z-index: 2;
    transform: translateX(-140px) translateY(30px) rotate(-8deg) scale(0.9);
}

.hero-phone-3 {
    z-index: 1;
    transform: translateX(140px) translateY(30px) rotate(6deg) scale(0.9);
}

.hero-phone:hover {
    z-index: 10;
    transform: translateY(-8px) rotate(0deg) scale(1.02) !important;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--gray-400);
    font-size: 13px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   SECTIONS — General
   ============================================================ */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 64px;
}

.section-label {
    display: inline-block;
    padding: 4px 14px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--orange-600);
    background: var(--orange-50);
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    line-height: 1.15;
}

.section-description {
    font-size: 17px;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ============================================================
   OVERVIEW SECTION
   ============================================================ */
.section-overview {
    background: var(--gray-50);
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.overview-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 32px 24px;
    border: 1px solid var(--gray-200);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-color, var(--orange-500));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.overview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.overview-card:hover::before {
    opacity: 1;
}

.overview-card-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--card-color) 10%, transparent);
    color: var(--card-color);
    margin-bottom: 20px;
}

.overview-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.overview-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 16px;
}

.overview-card-count {
    display: inline-block;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-500);
    background: var(--gray-100);
    border-radius: 100px;
}

@media (max-width: 900px) {
    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .overview-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   JOURNEY SECTION
   ============================================================ */
.journey-flow {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.journey-step {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    width: 100%;
    padding: 28px;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--gray-200);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.journey-step:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.journey-step-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--gray-200);
    line-height: 1;
    flex-shrink: 0;
}

.journey-step-content h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.journey-step-content p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
}

.journey-step-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--step-color) 10%, transparent);
    color: var(--step-color);
    flex-shrink: 0;
    margin-left: auto;
}

.journey-connector {
    padding: 8px 0;
    color: var(--gray-300);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================================
   CHAPTER DIVIDERS
   ============================================================ */
.chapter-divider {
    padding: 80px var(--container-padding);
    margin-bottom: 64px;
}

.chapter-divider-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 60px 48px;
    background: var(--gray-950);
    border-radius: var(--border-radius-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.chapter-divider-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--chapter-color);
}

.chapter-divider-inner::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--chapter-color), transparent 70%);
    opacity: 0.06;
    pointer-events: none;
}

.chapter-number {
    display: inline-block;
    padding: 5px 16px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--chapter-color);
    border: 1px solid color-mix(in srgb, var(--chapter-color) 30%, transparent);
    border-radius: 100px;
    margin-bottom: 20px;
}

.chapter-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 700;
    color: var(--white);
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.chapter-intro {
    font-size: 16px;
    color: var(--gray-400);
    line-height: 1.7;
    max-width: 580px;
    margin: 0 auto 24px;
}

.chapter-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.chapter-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-400);
}

.chapter-meta-item svg {
    opacity: 0.6;
}

/* ============================================================
   SCREENSHOT GALLERY
   ============================================================ */
.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px 32px;
}

.screenshot-gallery-centered {
    grid-template-columns: repeat(2, 1fr);
    max-width: 720px;
    margin: 0 auto;
}

.screenshot-item {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.screenshot-label {
    display: flex;
    align-items: baseline;
    gap: 2px;
}

.screenshot-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--gray-200);
    line-height: 1;
}

.screenshot-of {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-300);
}

.screenshot-card {
    position: relative;
    cursor: pointer;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    background: var(--gray-100);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.screenshot-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.screenshot-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,0.04) 100%);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.screenshot-card:hover::after {
    opacity: 1;
}

.phone-mockup {
    padding: 8px;
}

.phone-mockup img {
    width: 100%;
    height: auto;
    border-radius: calc(var(--border-radius-lg) - 4px);
}

.screenshot-caption h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.screenshot-caption p {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.6;
}

@media (max-width: 900px) {
    .screenshot-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 24px;
    }
    .screenshot-gallery-centered {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .screenshot-gallery,
    .screenshot-gallery-centered {
        grid-template-columns: 1fr;
        max-width: 360px;
        margin: 0 auto;
    }
}

/* ============================================================
   TECH STACK
   ============================================================ */
.section-tech {
    background: var(--gray-50);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.tech-category {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 28px;
    border: 1px solid var(--gray-200);
}

.tech-category-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-100);
}

.tech-category-title svg {
    color: var(--orange-500);
}

.tech-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tech-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    background: var(--gray-50);
    transition: background var(--transition-fast);
}

.tech-item:hover {
    background: var(--orange-50);
}

.tech-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
}

.tech-detail {
    font-size: 12px;
    color: var(--gray-400);
    text-align: right;
}

@media (max-width: 700px) {
    .tech-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   CLOSING SECTION
   ============================================================ */
.section-closing {
    position: relative;
    padding: 120px 0;
    background: var(--gray-950);
    overflow: hidden;
}

.closing-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(249, 115, 22, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(139, 92, 246, 0.06) 0%, transparent 40%);
    pointer-events: none;
}

.closing-content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.closing-logo {
    width: 72px;
    height: 72px;
    border-radius: var(--border-radius-lg);
    margin: 0 auto 24px;
    box-shadow: 0 8px 32px rgba(249, 115, 22, 0.2);
}

.closing-title {
    font-family: var(--font-display);
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    margin-bottom: 12px;
}

.closing-title-ns {
    color: var(--white);
}

.closing-title-mart {
    color: var(--orange-500);
}

.closing-tagline {
    font-size: 18px;
    color: var(--gray-400);
    margin-bottom: 48px;
}

.closing-summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.closing-summary-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.closing-summary-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--summary-color) 15%, transparent);
    color: var(--summary-color);
}

.closing-summary-item span {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-300);
}

.closing-summary-connector {
    font-size: 20px;
    color: var(--gray-600);
}

.closing-statement {
    font-size: 16px;
    color: var(--gray-400);
    line-height: 1.7;
    max-width: 520px;
    margin: 0 auto 40px;
}

.closing-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.closing-actions .btn-secondary {
    background: transparent;
    color: var(--gray-300);
    border-color: var(--gray-700);
}

.closing-actions .btn-secondary:hover {
    background: var(--gray-800);
    border-color: var(--gray-600);
}

/* ============================================================
   LIGHTBOX
   ============================================================ */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.lightbox.open {
    opacity: 1;
    pointer-events: all;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
    z-index: 10;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
    z-index: 10;
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-image {
    max-height: 75vh;
    max-width: 420px;
    width: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.4);
    transition: transform var(--transition-base);
}

.lightbox-caption {
    font-size: 15px;
    font-weight: 500;
    color: var(--white);
    text-align: center;
}

.lightbox-counter {
    font-size: 13px;
    color: var(--gray-400);
}

/* ============================================================
   PRESENTATION MODE
   ============================================================ */
.presentation-overlay {
    position: fixed;
    inset: 0;
    z-index: 3000;
    background: var(--gray-950);
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.presentation-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.presentation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

.presentation-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.presentation-logo {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.presentation-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-300);
}

.presentation-header-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.presentation-slide-info {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-500);
}

.presentation-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.presentation-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.presentation-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.presentation-progress {
    height: 2px;
    background: rgba(255, 255, 255, 0.06);
    flex-shrink: 0;
}

.presentation-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--orange-500);
    transition: width var(--transition-smooth);
}

.presentation-stage {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    overflow: hidden;
}

/* Presentation Slides */
.presentation-slide {
    display: none;
    width: 100%;
    max-width: 1000px;
    animation: slideIn var(--transition-smooth) forwards;
}

.presentation-slide.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Slide variants */
.slide-title-card {
    text-align: center;
}

.slide-title-card .slide-chapter-label {
    display: inline-block;
    padding: 5px 16px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 20px;
    border: 1px solid;
}

.slide-title-card h2 {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.slide-title-card p {
    font-size: 17px;
    color: var(--gray-400);
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.7;
}

.slide-screenshot {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    width: 100%;
}

.slide-screenshot-image {
    flex-shrink: 0;
}

.slide-screenshot-image img {
    max-height: 60vh;
    width: auto;
    max-width: 300px;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.4);
}

.slide-screenshot-info {
    max-width: 400px;
}

.slide-screenshot-number {
    font-size: 48px;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.08);
    line-height: 1;
    margin-bottom: 16px;
}

.slide-screenshot-info h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
}

.slide-screenshot-info p {
    font-size: 15px;
    color: var(--gray-400);
    line-height: 1.7;
}

/* Presentation Controls */
.presentation-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

.presentation-nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    color: var(--gray-400);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.presentation-nav-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--white);
}

.presentation-dots {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    max-width: 50vw;
    padding: 4px;
}

.presentation-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    flex-shrink: 0;
    transition: background var(--transition-fast), transform var(--transition-fast);
    cursor: pointer;
}

.presentation-dot.active {
    background: var(--orange-500);
    transform: scale(1.3);
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   RESPONSIVE HERO
   ============================================================ */
@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 48px;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-screenshots {
        min-height: 400px;
    }

    .hero-phone .phone-frame {
        width: 180px;
    }

    .hero-phone-2 {
        transform: translateX(-110px) translateY(20px) rotate(-8deg) scale(0.85);
    }

    .hero-phone-3 {
        transform: translateX(110px) translateY(20px) rotate(6deg) scale(0.85);
    }

    .chapter-divider-inner {
        padding: 48px 24px;
    }
}

@media (max-width: 560px) {
    .section {
        padding: 64px 0;
    }

    .hero-screenshots {
        min-height: 320px;
    }

    .hero-phone .phone-frame {
        width: 150px;
    }

    .hero-phone-2 {
        transform: translateX(-90px) translateY(20px) rotate(-8deg) scale(0.8);
    }

    .hero-phone-3 {
        transform: translateX(90px) translateY(20px) rotate(6deg) scale(0.8);
    }

    .hero-logo {
        width: 60px;
        height: 60px;
    }

    .closing-summary {
        gap: 12px;
    }

    .closing-summary-connector {
        display: none;
    }

    .closing-summary {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .slide-screenshot {
        flex-direction: column;
        gap: 24px;
    }

    .slide-screenshot-image img {
        max-height: 45vh;
        max-width: 240px;
    }

    .slide-screenshot-info {
        text-align: center;
    }

    .presentation-stage {
        padding: 20px;
    }
}

/* ============================================================
   PRINT STYLES (for presentation handouts)
   ============================================================ */
@media print {
    .nav,
    .progress-bar,
    .hero-scroll-indicator,
    .btn-presentation,
    .lightbox,
    .presentation-overlay {
        display: none !important;
    }

    .section {
        page-break-inside: avoid;
    }
}