/* 
 * Premium "White Light Design" System
 * Dentist Website & Scroll Animation
 */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f7;
    --text-primary: #111111;
    --text-secondary: #666666;
    --text-tertiary: #8e8e93;
    --border-color: #e5e5ea;
    --accent-color: #000000;
    --accent-grey: #86868b;
    --accent-glow: rgba(0, 0, 0, 0.03);
    --radius-lg: 16px;
    --radius-md: 8px;
    --transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-grey);
}

/* Preloader Screen */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-primary);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.preloader.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader-badge {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeIn 1s forwards;
}

.loader-bar-outer {
    width: 200px;
    height: 2px;
    background-color: var(--bg-tertiary);
    border-radius: 1px;
    overflow: hidden;
    margin-bottom: 12px;
}

.loader-bar-inner {
    width: 0%;
    height: 100%;
    background-color: var(--accent-color);
    transition: width 0.1s ease-out;
}

.loader-percentage {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Header/Navigation */
header.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 24px 40px;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid transparent;
    background-color: rgba(255, 255, 255, 0.01);
    backdrop-filter: blur(0px);
    transition: var(--transition);
}

header.nav-header.scrolled {
    background-color: rgba(255, 255, 255, 0.85);
    border-bottom-color: var(--border-color);
    backdrop-filter: blur(20px);
    padding: 16px 40px;
}

.logo {
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    width: 10px;
    height: 10px;
    background-color: var(--accent-color);
    border-radius: 50%;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-cta {
    text-decoration: none;
    color: #ffffff;
    background-color: var(--accent-color);
    padding: 8px 20px;
    border-radius: 9999px;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--accent-color);
}

.nav-cta:hover {
    background-color: transparent;
    color: var(--accent-color);
}

/* Badge System */
.badge-pill {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: 9999px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(15px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Hero Section */
.hero-section {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    position: relative;
    padding: 0 20px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    color: var(--text-primary);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

.hero-description {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
}

.hero-actions {
    display: flex;
    gap: 16px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.6s forwards;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    background-color: var(--accent-color);
    color: #ffffff;
    border: 1px solid var(--accent-color);
    border-radius: 9999px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.btn-secondary:hover {
    border-color: var(--accent-color);
    background-color: var(--bg-secondary);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    text-transform: uppercase;
    opacity: 0;
    animation: fadeIn 1.5s forwards 1.2s;
}

.scroll-indicator::after {
    content: '';
    width: 1px;
    height: 40px;
    background-color: var(--border-color);
    animation: scrollLine 2s infinite ease-in-out;
}

/* Canvas Animation Section (Sticky System) */
.animation-container {
    position: relative;
    width: 100%;
    /* ScrollTrigger will pin the wrapper inside this container */
    height: 400vh; /* Adjust height to control speed/duration of scrub */
    background-color: var(--bg-secondary);
}

.sticky-wrapper {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

video#sequence-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    background-color: var(--bg-secondary);
}

/* Typographic Caption Overlays */
.caption-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* Let clicks pass through to canvas if needed */
}

.caption-card {
    position: absolute;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    max-width: 600px;
    padding: 0 20px;
}

.caption-card h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-shadow: 0 4px 30px rgba(255, 255, 255, 0.4);
}

.caption-card p {
    font-size: clamp(0.9rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Normal Content Sections */
.content-section {
    padding: 120px 40px;
    background-color: var(--bg-primary);
    position: relative;
    z-index: 3;
    border-top: 1px solid var(--border-color);
}

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

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 80px;
    text-align: center;
}

.section-header h2 {
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.service-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.service-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.02);
}

.service-icon {
    font-size: 2rem;
    margin-bottom: 24px;
}

.service-card h3 {
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 24px;
}

.service-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
    transition: var(--transition);
}

.service-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.service-card:hover .service-link::after {
    transform: translateX(4px);
}

/* Technology Detail (Split Layout) */
.tech-split {
    display: grid;
    grid-template-columns: 1fr;
    gap: 60px;
    align-items: center;
}

@media (min-width: 992px) {
    .tech-split {
        grid-template-columns: 1fr 1fr;
    }
}

.tech-content {
    max-width: 540px;
}

.tech-tag {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-grey);
    margin-bottom: 16px;
    display: inline-block;
}

.tech-content h3 {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    line-height: 1.15;
}

.tech-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 30px;
}

.tech-features {
    list-style: none;
}

.tech-features li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    font-size: 0.9375rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 16px;
}

.tech-features li::before {
    content: '✓';
    color: var(--text-primary);
    font-weight: 700;
}

.tech-image-container {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-placeholder-img {
    font-size: 1rem;
    color: var(--text-tertiary);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Footer Section */
footer {
    padding: 80px 40px;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 768px) {
    .footer-top {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-top: 16px;
    max-width: 320px;
    line-height: 1.6;
}

.footer-links-col h4 {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.footer-links-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links-col a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.footer-links-col a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
    }
}

.footer-socials {
    display: flex;
    gap: 24px;
}

.footer-socials a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-socials a:hover {
    color: var(--text-primary);
}

/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes scrollLine {
    0% {
        transform: scaleY(0);
        transform-origin: top;
    }
    50% {
        transform: scaleY(1);
        transform-origin: top;
    }
    50.1% {
        transform: scaleY(1);
        transform-origin: bottom;
    }
    100% {
        transform: scaleY(0);
        transform-origin: bottom;
    }
}