/* ==========================================================================
   Ternity Education Website Styles
   Refined Minimalist Design System
   ========================================================================== */

/* ==========================================================================
   CSS Reset & Base Styles
   ========================================================================== */

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.5;
    color: #374151;
    background-color: #FFFFFF;
    overflow-x: hidden;
}

/* ==========================================================================
   Design System Variables
   ========================================================================== */

:root {
    /* Colors */
    --color-white: #FFFFFF;
    --color-ternity-blue: #87CEEB;
    --color-almost-white: #FAFBFC;
    --color-light-gray: #F3F4F6;
    --color-text-gray: #6B7280;
    --color-dark-gray: #374151;
    --color-almost-black: #053B61;
    --color-blue-accent: #6BB6D9;
    --color-success: #34D399;
    --color-error: #F87171;

    /* Spacing */
    --space-xs: 0.5rem;    /* 8px */
    --space-sm: 1rem;      /* 16px */
    --space-md: 2rem;      /* 32px */
    --space-lg: 4rem;      /* 64px */
    --space-xl: 6rem;      /* 96px */
    --space-2xl: 8rem;     /* 128px */
    --space-3xl: 12rem;    /* 192px */

    /* Typography */
    --font-size-hero: clamp(3rem, 8vw, 7rem);
    --font-size-h1: clamp(2.5rem, 6vw, 5rem);
    --font-size-h2: clamp(2rem, 5vw, 4rem);
    --font-size-h3: clamp(1.5rem, 4vw, 2.5rem);
    --font-size-h4: clamp(1.25rem, 3vw, 1.75rem);
    --font-size-body: clamp(1rem, 2vw, 1.25rem);
    --font-size-small: 0.875rem;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;

    --line-height-tight: 1.1;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.7;

    /* Shadows */
    --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-card: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-prominent: 0 10px 30px rgba(135, 206, 235, 0.15);
    --shadow-hover: 0 20px 40px rgba(135, 206, 235, 0.2);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-pill: 9999px;

    /* Transitions */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 600ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Container */
    --container-max-width: 1200px;
    --container-padding: 2rem;
}

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

h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    color: var(--color-almost-black);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
}

.hero-headline {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: var(--font-weight-black);
    line-height: 1.1;
    color: var(--color-almost-black);
    margin-bottom: 1.5rem;
}

.section-headline {
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    color: var(--color-almost-black);
    margin-bottom: var(--space-md);
}

.section-headline.centered {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.body-text {
    font-size: var(--font-size-body);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-gray);
    max-width: 65ch;
}

.body-text.centered {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

sup {
    font-size: 0.6em;
    vertical-align: super;
    line-height: 0;
    text-transform: lowercase;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */

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

.section {
    padding: var(--space-xl) 0;
}

.section-white {
    background-color: var(--color-white);
}

.section-gray {
    background-color: var(--color-light-gray);
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: transparent;
    transition: all var(--transition-normal);
    padding: var(--space-md) 0;
}

.nav.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-subtle);
    border-bottom: 1px solid var(--color-light-gray);
    padding: var(--space-sm) 0;
}

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

.logo {
    height: 50px;
    width: auto;
    transition: height var(--transition-normal);
}

.nav.scrolled .logo {
    height: 40px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-md);
    align-items: center;
}

.nav-link {
    color: var(--color-dark-gray);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    position: relative;
    transition: color var(--transition-fast);
    font-size: 1rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-ternity-blue);
    transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-ternity-blue);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.cta-nav {
    background-color: var(--color-ternity-blue);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-pill);
}

.nav-link.cta-nav::after {
    display: none;
}

.nav-link.cta-nav:hover {
    background-color: var(--color-blue-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-prominent);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background-color: var(--color-dark-gray);
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-white);
    z-index: 999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.mobile-menu.active {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu-links {
    list-style: none;
    text-align: center;
}

.mobile-menu-links li {
    margin: var(--space-md) 0;
}

.mobile-link {
    color: var(--color-almost-black);
    text-decoration: none;
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-semibold);
    transition: color var(--transition-fast);
}

.mobile-link:hover {
    color: var(--color-ternity-blue);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 100px;
    background-color: var(--color-white);
}

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

.hero-content {
    max-width: 900px;
}

.hero-tagline {
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-gray);
    margin-bottom: var(--space-sm);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.2s;
}

.hero-headline {
    margin-bottom: var(--space-lg);
}

.hero-headline .line {
    display: block;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-headline .line:nth-child(1) {
    animation-delay: 0.4s;
}

.hero-headline .line:nth-child(2) {
    animation-delay: 0.6s;
}

.hero-headline .line:nth-child(3) {
    animation-delay: 0.8s;
}

.hero-subheadline {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-gray);
    margin-bottom: 2.5rem;
    max-width: 700px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1s;
}

.hero-subheadline strong {
    color: var(--color-almost-black);
    font-weight: 600;
}

.hero-ctas {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1.2s;
}

.trust-badges {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1.4s;
}

.badge {
    font-size: var(--font-size-small);
    color: var(--color-text-gray);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.badge:hover {
    color: var(--color-ternity-blue);
}

.badge-divider {
    color: var(--color-light-gray);
}

/* Hero Background Animation */
.hero-background {
    position: absolute;
    top: 0;
    right: -10%;
    width: 50%;
    height: 100%;
    z-index: 1;
    opacity: 0.5;
    pointer-events: none;
}

.geometric-pattern {
    width: 100%;
    height: 100%;
    animation: floatPattern 20s ease-in-out infinite;
}

@keyframes floatPattern {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    50% {
        transform: translate(-20px, 20px) rotate(2deg);
    }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    border-radius: var(--radius-pill);
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--color-ternity-blue);
    color: white;
    box-shadow: var(--shadow-card);
}

.btn-primary:hover {
    background-color: var(--color-blue-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-large {
    width: 100%;
    padding: 1.25rem 2.5rem;
    font-size: 1.25rem;
}

.btn-text {
    color: var(--color-ternity-blue);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    position: relative;
    display: inline-flex;
    align-items: center;
    transition: color var(--transition-fast);
}

.btn-text::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-ternity-blue);
    transition: width var(--transition-fast);
}

.btn-text:hover {
    color: var(--color-blue-accent);
}

.btn-text:hover::after {
    width: 0;
}

/* ==========================================================================
   Problem Section (The Challenge)
   ========================================================================== */

.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.eyebrow {
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ternity-blue);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-sm);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.stat-item {
    padding: var(--space-md);
    border-left: 3px solid var(--color-ternity-blue);
    background-color: var(--color-almost-white);
    border-radius: var(--radius-sm);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.stat-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.stat-number {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-black);
    color: var(--color-ternity-blue);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-number::after {
    content: '%';
    font-size: 0.6em;
}

.stat-label {
    font-size: var(--font-size-small);
    color: var(--color-text-gray);
    line-height: var(--line-height-normal);
}

/* Container */
.gap-container {
    max-width: 700px;
    margin: 3rem auto;
    padding: 2rem;
}

/* Visual area */
.gap-visual {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 3rem;
    min-height: 350px;
    padding: 2rem 0;
    position: relative;
}

/* Bar Wrapper */
.gap-bar-wrapper {
    flex: 1;
    max-width: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

/* Bar */
.gap-bar {
    width: 100%;
    height: 300px;
    background: #F3F4F6;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.gap-bar-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 0%;
    border-radius: 12px;
    transition: height 1.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Animate when visible */
.gap-bar.animate .gap-bar-fill {
    height: 100%;
}

/* High bar - Ternity Blue */
.gap-bar-high .gap-bar-fill {
    background: linear-gradient(180deg, #87CEEB 0%, #5BA8CB 100%);
}

/* Low bar - Darker Blue */
.gap-bar-low .gap-bar-fill {
    background: linear-gradient(180deg, #87CEEB 0%, #053B61 100%);
}

/* Bar Labels */
.gap-bar-label {
    text-align: center;
    width: 100%;
}

.gap-bar-title {
    font-size: 1rem;
    font-weight: 600;
    color: #053B61;
    margin-bottom: 0.5rem;
}

.gap-bar-stat {
    font-size: 2rem;
    font-weight: 900;
    color: #053B61;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.6s ease 1.5s;
}

.gap-bar.animate + .gap-bar-label .gap-bar-stat {
    opacity: 1;
    transform: translateY(0);
}

/* Gap Arrow */
.gap-arrow-container {
    display: flex;
    align-items: center;
    align-self: center;
    min-width: 120px;
    margin: 0 1rem;
}

.gap-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
}

.arrow-line {
    width: 2px;
    height: 60px;
    background: #053B61;
    position: relative;
    opacity: 0;
    transition: opacity 0.6s ease 2s;
}

.gap-bar.animate ~ .gap-arrow-container .arrow-line {
    opacity: 0.3;
}

.arrow-line:first-child::after,
.arrow-line:last-child::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
}

.arrow-line:first-child::after {
    bottom: -6px;
    border-top: 8px solid #053B61;
}

.arrow-line:last-child::before {
    top: -6px;
    border-bottom: 8px solid #053B61;
}

.gap-text {
    padding: 1rem 1.5rem;
    background: white;
    border: 3px solid #053B61;
    border-radius: 12px;
    text-align: center;
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 2s;
}

.gap-bar.animate ~ .gap-arrow-container .gap-text {
    opacity: 1;
    transform: scale(1);
}

.gap-emphasis {
    display: block;
    font-size: 1.25rem;
    font-weight: 900;
    color: #053B61;
    white-space: nowrap;
}

/* Bottom Message */
.gap-message {
    text-align: center;
    font-size: 1.125rem;
    color: #6B7280;
    line-height: 1.6;
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(135, 206, 235, 0.05);
    border-radius: 12px;
    border-left: 4px solid #87CEEB;
}

/* ==========================================================================
   Solution Section (Cards)
   ========================================================================== */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.solution-card {
    background-color: var(--color-white);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-light-gray);
    box-shadow: var(--shadow-card);
    transform: rotate(var(--rotation));
    transition: all var(--transition-normal);
    opacity: 0;
    animation: cardFadeIn 0.8s ease forwards;
}

.solution-card:nth-child(1) {
    animation-delay: 0.2s;
}

.solution-card:nth-child(2) {
    animation-delay: 0.4s;
}

.solution-card:nth-child(3) {
    animation-delay: 0.6s;
}

.solution-card:hover {
    transform: rotate(0deg) translateY(-8px);
    border-color: var(--color-ternity-blue);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
    stroke: var(--color-ternity-blue);
    transition: transform var(--transition-normal);
}

.solution-card:hover .card-icon {
    transform: scale(1.1);
}

.card-title {
    font-size: var(--font-size-h4);
    font-weight: var(--font-weight-semibold);
    color: var(--color-almost-black);
    margin-bottom: var(--space-sm);
    line-height: var(--line-height-tight);
}

.card-description {
    font-size: 1.125rem;
    color: var(--color-text-gray);
    line-height: var(--line-height-normal);
    margin-bottom: var(--space-md);
}

.card-link {
    color: var(--color-ternity-blue);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: color var(--transition-fast);
}

.card-link:hover {
    color: var(--color-blue-accent);
}

@keyframes cardFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px) rotate(var(--rotation));
    }
    to {
        opacity: 1;
        transform: translateY(0) rotate(var(--rotation));
    }
}

/* ==========================================================================
   Meet Haihao Section
   ========================================================================== */

.haihao-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.haihao-image-side {
    position: relative;
}

.image-wrapper {
    position: relative;
    width: 100%;
}

.image-placeholder {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.image-placeholder img {
    width: 100%;
    height: auto;
    display: block;
    filter: grayscale(100%);
    transition: filter var(--transition-normal);
}

.image-placeholder:hover img {
    filter: grayscale(0%);
}

.diagonal-divider {
    position: absolute;
    top: 0;
    right: -20px;
    width: 2px;
    height: 100%;
    background-color: var(--color-ternity-blue);
    transform: rotate(5deg);
    transform-origin: top;
}

.credentials-list {
    list-style: none;
    margin: var(--space-lg) 0;
}

.credential-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.credential-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.credential-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.credential-text {
    font-size: 1.125rem;
    color: var(--color-dark-gray);
    line-height: var(--line-height-normal);
}

.team-member-links {
    margin-top: 1.5rem;
    display: flex;
    justify-content: flex-start;
}

.profile-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #87CEEB 0%, #FFFFFF 100%);
    color: #053B61;
    text-decoration: none;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(135, 206, 235, 0.3);
}

.profile-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(135, 206, 235, 0.3);
    background: linear-gradient(135deg, #6BB6D9 0%, #87CEEB 100%);
}

.link-icon {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   Process Timeline Section
   ========================================================================== */

.timeline {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
}

.timeline-line {
    position: absolute;
    top: 40px;
    left: 10%;
    right: 10%;
    height: 2px;
    background-color: var(--color-light-gray);
}

.timeline-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background-color: var(--color-ternity-blue);
    transition: width 2s ease;
}

.timeline-line.animate::after {
    width: 100%;
}

.timeline-step {
    position: relative;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.timeline-step.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation for each step */
.timeline-step:nth-child(2) {
    transition-delay: 150ms;
}

.timeline-step:nth-child(3) {
    transition-delay: 300ms;
}

.timeline-step:nth-child(4) {
    transition-delay: 450ms;
}

.timeline-step:nth-child(5) {
    transition-delay: 600ms;
}

.step-number {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-black);
    color: var(--color-ternity-blue);
    line-height: 1;
    margin-bottom: var(--space-sm);
    transition: transform var(--transition-normal);
}

.timeline-step:hover .step-number {
    transform: scale(1.1);
}

.step-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-md);
    color: var(--color-text-gray);
    transition: color var(--transition-normal);
}

.timeline-step:hover .step-icon {
    color: var(--color-ternity-blue);
}

.step-title {
    font-size: var(--font-size-h4);
    font-weight: var(--font-weight-semibold);
    color: var(--color-almost-black);
    margin-bottom: var(--space-sm);
}

.step-description {
    font-size: 1rem;
    color: var(--color-text-gray);
    line-height: var(--line-height-normal);
}

/* ==========================================================================
   Booking Section
   ========================================================================== */

.booking-container {
    max-width: 600px;
    margin: 0 auto;
}

.booking-subheadline {
    margin-bottom: var(--space-xl);
}

.booking-form-wrapper {
    background-color: var(--color-almost-white);
    padding: var(--space-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
}

.booking-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-dark-gray);
    margin-bottom: var(--space-xs);
}

.required {
    color: var(--color-error);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    background-color: var(--color-white);
    color: var(--color-dark-gray);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-ternity-blue);
    box-shadow: 0 0 0 3px rgba(135, 206, 235, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-gray);
    opacity: 0.6;
}

.form-note {
    font-size: var(--font-size-small);
    color: var(--color-text-gray);
    text-align: center;
    margin-top: var(--space-md);
}

.booking-alternative {
    margin-top: var(--space-md);
    text-align: center;
    font-size: var(--font-size-small);
    color: var(--color-text-gray);
}

.booking-alternative a {
    color: var(--color-ternity-blue);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
}

.booking-alternative a:hover {
    color: var(--color-blue-accent);
    text-decoration: underline;
}

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

.footer {
    background-color: var(--color-almost-black);
    color: var(--color-text-gray);
    padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    margin-bottom: var(--space-lg);
}

.footer-logo {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.8;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--color-text-gray);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.footer-nav a:hover {
    color: var(--color-ternity-blue);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--space-sm);
}

.social-link {
    color: var(--color-text-gray);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.social-link:hover {
    color: var(--color-ternity-blue);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: var(--font-size-small);
}

/* ==========================================================================
   Floating CTA
   ========================================================================== */

.floating-cta {
    position: fixed;
    bottom: var(--space-md);
    right: var(--space-md);
    z-index: 900;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.floating-cta.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.btn-floating {
    box-shadow: var(--shadow-prominent);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: var(--shadow-prominent);
    }
    50% {
        box-shadow: var(--shadow-hover);
    }
}

/* ==========================================================================
   Neural Network Background
   ========================================================================== */

.neural-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

/* Floating geometric shapes */
.neural-shape {
    position: absolute;
    width: 100px;
    height: 100px;
    border: 2px solid rgba(135, 206, 235, 0.15);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.shape-2 {
    top: 30%;
    right: 10%;
    width: 80px;
    height: 80px;
    animation-delay: 3s;
    animation-duration: 25s;
}

.shape-3 {
    bottom: 20%;
    left: 15%;
    width: 120px;
    height: 120px;
    border-radius: 20%;
    animation-delay: 6s;
    animation-duration: 30s;
}

.shape-4 {
    bottom: 15%;
    right: 20%;
    width: 90px;
    height: 90px;
    animation-delay: 9s;
    animation-duration: 22s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(20px, -20px) rotate(5deg);
    }
    50% {
        transform: translate(-15px, 10px) rotate(-5deg);
    }
    75% {
        transform: translate(10px, 15px) rotate(3deg);
    }
}

/* Neural network SVG */
.neural-network {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.4;
}

.node {
    fill: #87CEEB;
    opacity: 0.6;
    animation: pulse 3s ease-in-out infinite;
}

.node:nth-child(2n) {
    animation-delay: 0.5s;
}

.node:nth-child(3n) {
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.4;
    }
    50% {
        opacity: 0.8;
    }
}

.connection {
    stroke: #87CEEB;
    stroke-width: 1;
    opacity: 0.15;
    stroke-dasharray: 5, 5;
    animation: dash 20s linear infinite;
}

@keyframes dash {
    to {
        stroke-dashoffset: -100;
    }
}

/* Ensure content is above background */
.section {
    position: relative;
    z-index: 1;
}

/* ==========================================================================
   Animations
   ========================================================================== */

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

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

@media (max-width: 1024px) {
    :root {
        --container-padding: 1.5rem;
        --space-xl: 4rem;
        --space-2xl: 6rem;
    }

    .two-column,
    .haihao-layout {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .visual-side {
        order: -1;
    }

    .timeline {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

    .timeline-line {
        display: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-contact {
        align-items: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --space-lg: 3rem;
        --space-xl: 3rem;
    }

    /* Navigation */
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    /* Hero */
    .hero {
        min-height: auto;
        padding: var(--space-2xl) 0 var(--space-xl);
    }

    .hero-background {
        width: 80%;
        opacity: 0.3;
    }

    .hero-ctas {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .trust-badges {
        flex-wrap: wrap;
        justify-content: center;
    }

    /* Gap Visualization - Mobile */
    .gap-visual {
        gap: 2rem;
        min-height: 250px;
        padding: 1rem 0;
    }

    .gap-bar {
        height: 200px;
    }

    .gap-arrow-container {
        padding: 0 0.5rem;
    }

    .gap-text {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }

    .gap-emphasis {
        font-size: 1rem;
    }

    .gap-bar-label {
        font-size: 0.875rem;
    }

    .gap-bar-stat {
        font-size: 1.5rem;
    }

    .arrow-line {
        width: 30px;
    }

    /* Cards */
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .solution-card {
        transform: rotate(0deg) !important;
    }

    /* Timeline */
    .timeline {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    /* Booking */
    .booking-form-wrapper {
        padding: var(--space-md);
    }

    /* Floating CTA */
    .floating-cta {
        left: var(--space-md);
        right: var(--space-md);
    }

    .btn-floating {
        width: 100%;
        text-align: center;
    }

    /* Hide neural background on mobile for performance */
    .neural-background {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-headline {
        font-size: clamp(2rem, 10vw, 3rem);
    }

    .section-headline {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
    }

    .stat-number {
        font-size: clamp(2rem, 10vw, 3rem);
    }
}

/* ==========================================================================
   Accessibility & Motion Preferences
   ========================================================================== */

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

    /* Disable neural background animations for accessibility */
    .neural-shape,
    .node,
    .connection {
        animation: none !important;
    }

    /* Disable gap visualization animations for accessibility */
    .gap-bar-fill,
    .gap-text {
        transition: none !important;
    }

    .gap-bar.animate .gap-bar-fill {
        height: var(--final-height, 0%) !important;
    }
}

/* Focus visible for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-ternity-blue);
    outline-offset: 2px;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}