/* ==========================================================================
   Vasculab - Modern CSS Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #0066cc;
    --color-primary-dark: #004d99;
    --color-primary-light: #e6f0fa;
    --color-secondary: #00a86b;
    --color-accent: #ff6b35;

    --color-text: #1a1a2e;
    --color-text-light: #4a4a68;
    --color-text-muted: #6b7280;

    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* YouTube Red */
    --color-youtube: #ff0000;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

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

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --transition-slow: 300ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
    height: auto;
}

input, button, textarea, select {
    font: inherit;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    color: var(--color-text);
}

ul, ol {
    list-style: none;
}

address {
    font-style: normal;
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.btn-youtube:hover {
    background: #cc0000;
    color: white;
    transform: translateY(-1px);
}

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

.btn-white:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.btn-outline-white {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
    background: white;
    color: var(--color-primary);
    border-color: white;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-primary);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    border-radius: var(--radius);
    color: white;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-light);
}

.nav-link:hover {
    color: var(--color-primary);
}

.external-icon {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

.nav-cta {
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius);
}

.nav-cta:hover {
    background: var(--color-primary-dark);
    color: white;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    z-index: 99;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav a {
    display: block;
    padding: var(--space-md) 0;
    font-weight: 500;
    border-bottom: 1px solid var(--color-border-light);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    padding: var(--space-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 650px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: var(--text-4xl);
    margin-bottom: var(--space-lg);
}

.hero-title span {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.hero-bg {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 70%;
    height: 200%;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    opacity: 0.05;
    pointer-events: none;
}

/* --------------------------------------------------------------------------
   Section Header
   -------------------------------------------------------------------------- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section-title {
    font-family: var(--font-serif);
    font-size: var(--text-3xl);
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: var(--text-base);
    color: var(--color-text-muted);
}

.section-subtitle a {
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   Video Section
   -------------------------------------------------------------------------- */
.video-section {
    padding: var(--space-3xl) 0;
    background: var(--color-bg);
}

.video-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

.video-container {
    background: var(--color-bg-dark);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.video-player {
    position: relative;
    padding-top: 56.25%; /* 16:9 */
}

.video-thumbnail,
.video-iframe-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-thumbnail .play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: none;
    border: none;
    cursor: pointer;
    transition: transform var(--transition);
}

.video-thumbnail .play-btn svg {
    width: 68px;
    height: 48px;
}

.video-thumbnail .play-btn:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.video-duration {
    position: absolute;
    bottom: var(--space-md);
    right: var(--space-md);
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-sm);
    font-weight: 600;
    color: white;
    background: rgba(0, 0, 0, 0.8);
    border-radius: var(--radius-sm);
}

.video-iframe-container iframe {
    width: 100%;
    height: 100%;
}

.video-info {
    padding: var(--space-lg) 0;
}

.video-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-sm);
}

.video-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.video-separator {
    opacity: 0.5;
}

.video-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--color-text-light);
}

.stat svg {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.video-description {
    font-size: var(--text-sm);
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

/* --------------------------------------------------------------------------
   Articles Section
   -------------------------------------------------------------------------- */
.articles-section {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-alt);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.article-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

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

.article-link {
    display: block;
    color: inherit;
}

.article-link:hover {
    color: inherit;
}

.article-image {
    position: relative;
    height: 180px;
    overflow: hidden;
    background: var(--color-bg-alt);
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-image-placeholder svg {
    width: 48px;
    height: 48px;
    color: var(--color-border);
}

.article-content {
    padding: var(--space-lg);
}

.article-date {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.article-title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-light);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.article-read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
}

.article-read-more svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
}

.article-card:hover .article-read-more svg {
    transform: translateX(4px);
}

.articles-cta {
    text-align: center;
    margin-top: var(--space-2xl);
}

/* --------------------------------------------------------------------------
   CTA Section
   -------------------------------------------------------------------------- */
.cta-section {
    padding: var(--space-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-serif);
    font-size: var(--text-3xl);
    color: white;
    margin-bottom: var(--space-md);
}

.cta-text {
    font-size: var(--text-lg);
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

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

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--space-3xl) 0 var(--space-xl);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-xl);
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-md);
}

.footer-logo:hover {
    color: white;
    opacity: 0.9;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
}

.footer-logo .logo-icon svg {
    width: 20px;
    height: 20px;
}

.footer-description {
    font-size: var(--text-sm);
    opacity: 0.7;
}

.footer-links h4,
.footer-contact h4 {
    color: white;
    font-size: var(--text-base);
    margin-bottom: var(--space-md);
}

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

.footer-links a {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-contact address {
    font-size: var(--text-sm);
}

.footer-contact p {
    margin-bottom: var(--space-xs);
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-md);
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: var(--text-sm);
    opacity: 0.7;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.9);
}

.footer-bottom a:hover {
    color: white;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
    .video-wrapper {
        grid-template-columns: 1.5fr 1fr;
        align-items: start;
    }

    .video-info {
        padding: 0;
    }
}

@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --text-4xl: 2rem;
        --text-3xl: 1.75rem;
    }

    .nav {
        display: none;
    }

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

    .hero {
        padding: var(--space-2xl) 0;
    }

    .hero-title {
        font-size: var(--text-3xl);
    }

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

    .hero-cta .btn {
        width: 100%;
    }

    .video-wrapper {
        grid-template-columns: 1fr;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .cta-buttons .btn {
        width: 100%;
    }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    .header,
    .mobile-nav,
    .hero-cta,
    .video-section,
    .cta-section,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
        color: black;
        background: white;
    }

    .article-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}