@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600&display=swap');

:root {
    /* Carbon Colors - Gray 10 Theme */
    --cds-background: #ffffff;
    --cds-layer-01: #f4f4f4;
    --cds-layer-02: #e0e0e0;
    --cds-text-primary: #161616;
    --cds-text-secondary: #525252;
    --cds-link-primary: #0f62fe;
    --cds-border-subtle: #e0e0e0;
    --cds-border-strong: #8d8d8d;
    --cds-focus: #0f62fe;
    
    /* Spacing */
    --cds-spacing-01: 0.125rem; /* 2px */
    --cds-spacing-02: 0.25rem;   /* 4px */
    --cds-spacing-03: 0.5rem;    /* 8px */
    --cds-spacing-04: 0.75rem;   /* 12px */
    --cds-spacing-05: 1rem;      /* 16px */
    --cds-spacing-06: 1.5rem;    /* 24px */
    --cds-spacing-07: 2rem;      /* 32px */
    --cds-spacing-08: 2.5rem;    /* 40px */
    --cds-spacing-09: 3rem;      /* 48px */
}

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

body {
    font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--cds-background);
    color: var(--cds-text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--cds-spacing-05);
}

section {
    padding: var(--cds-spacing-09) 0;
    border-bottom: 1px solid var(--cds-border-subtle);
}

/* Typography */
h1 { font-size: 3.375rem; font-weight: 300; letter-spacing: 0; margin-bottom: var(--cds-spacing-05); }
h2 { font-size: 2rem; font-weight: 400; margin-bottom: var(--cds-spacing-07); }
h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: var(--cds-spacing-03); }
p { font-size: 1rem; margin-bottom: var(--cds-spacing-05); color: var(--cds-text-secondary); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--cds-spacing-05) var(--cds-spacing-07);
    font-size: 0.875rem;
    font-weight: 400;
    text-decoration: none;
    transition: background 70ms cubic-bezier(0, 0, 0.38, 0.9);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: #0353e9;
}

.btn-secondary {
    background-color: #393939;
    color: white;
}

.btn-secondary:hover {
    background-color: #4c4c4c;
}

/* Navbar */
nav {
    height: 3rem;
    background-color: #161616;
    color: white;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav .logo {
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.1px;
}

/* Hero */
.hero {
    background-color: #161616;
    color: white;
    padding: var(--cds-spacing-09) 0;
    background-image: 
        linear-gradient(to right, #262626 1px, transparent 1px),
        linear-gradient(to bottom, #262626 1px, transparent 1px);
    background-size: 32px 32px;
}

.hero h1 { color: white; }
.hero p { color: #c6c6c6; max-width: 600px; }

.hero-actions {
    display: flex;
    gap: 1px;
    margin-top: var(--cds-spacing-07);
}

/* Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1px;
    background-color: var(--cds-border-subtle);
}

.card {
    background-color: var(--cds-background);
    padding: var(--cds-spacing-06);
    display: flex;
    flex-direction: column;
    border: 1px solid transparent;
}

.card:hover {
    border: 1px solid var(--cds-link-primary);
}

/* Steps */
.step-tile {
    background-color: var(--cds-layer-01);
    padding: var(--cds-spacing-06);
    border-bottom: 1px solid var(--cds-border-strong);
}

.step-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--cds-link-primary);
    margin-bottom: var(--cds-spacing-03);
}

/* Timeline */
.timeline-item {
    padding-left: var(--cds-spacing-07);
    border-left: 1px solid var(--cds-border-strong);
    position: relative;
    margin-bottom: var(--cds-spacing-08);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -4.5px;
    top: 0;
    width: 8px;
    height: 8px;
    background-color: var(--cds-link-primary);
}

.timeline-date {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--cds-spacing-02);
}

/* News Section */
#news-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--cds-spacing-05);
}

.news-card {
    border: 1px solid var(--cds-border-subtle);
    padding: var(--cds-spacing-06);
    transition: all 0.2s ease;
}

.news-card:hover {
    background-color: var(--cds-layer-01);
}

/* Animations & Transitions */
:root {
    --cds-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --cds-transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.news-content-full {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.3s ease-out,
                margin 0.3s ease-out,
                padding 0.3s ease-out;
    margin-top: 0;
    padding-top: 0;
    border-top: 1px solid transparent;
}

.news-card.expanded .news-content-full {
    max-height: 1000px;
    opacity: 1;
    margin-top: var(--cds-spacing-04);
    padding-top: var(--cds-spacing-04);
    border-top: 1px solid var(--cds-border-subtle);
}

.news-card {
    transition: var(--cds-transition);
}

.btn {
    transition: var(--cds-transition);
}

.news-preview {
    transition: opacity 0.3s ease-out;
}

.news-card.expanded .news-preview {
    opacity: 0;
    height: 0;
    margin: 0;
    overflow: hidden;
}

/* Skeleton */
.skeleton {
    background: linear-gradient(90deg, #f4f4f4 25%, #e0e0e0 50%, #f4f4f4 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    height: 150px;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Footer */
footer {
    padding: var(--cds-spacing-08) 0;
    background-color: #161616;
    color: #c6c6c6;
    font-size: 0.875rem;
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero-actions { flex-direction: column; }
    footer .container { flex-direction: column; align-items: flex-start; gap: var(--cds-spacing-05); }
}