/* Bespoke Modern & Professional CSS for ZeroFeed Landing Page */
:root {
    --bg-main: #080A0F;
    --bg-card: #0E121B;
    --bg-card-hover: #151B28;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(0, 242, 254, 0.3);
    
    --cyan: #00F2FE;
    --cyan-glow: #4FACFE;
    --cyan-dim: rgba(0, 242, 254, 0.08);
    --cyan-border: rgba(0, 242, 254, 0.22);
    
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;
    
    --green: #10B981;
    --green-dim: rgba(16, 185, 129, 0.1);
    --green-border: rgba(16, 185, 129, 0.25);
    
    --red: #EF4444;
    --red-dim: rgba(239, 68, 68, 0.1);
    --red-border: rgba(239, 68, 68, 0.25);
    
    --yellow: #F59E0B;
    --blue: #60A5FA;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    scroll-behavior: smooth;
}

body {
    position: relative;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Background Grid & Subtle Ambient Glows */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(to right, rgba(255, 255, 255, 0.015) 1px, transparent 1px),
                      linear-gradient(to bottom, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    z-index: -2;
}

.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(150px);
    pointer-events: none;
    z-index: -1;
    opacity: 0.12;
}

.orb-1 {
    top: -120px;
    left: 25%;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, var(--cyan) 0%, var(--cyan-glow) 100%);
}

.orb-2 {
    bottom: 5%;
    right: 15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #3B82F6 0%, #6366F1 100%);
}

/* Text Utilities */
.cyan-gradient {
    background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.t-cyan { color: var(--cyan); }
.t-green { color: var(--green); }
.t-red { color: #F87171; }
.t-yellow { color: #FBBF24; }
.t-blue { color: #60A5FA; }

/* Header Navigation */
.header {
    border-bottom: 1px solid var(--border-color);
    background: rgba(8, 10, 15, 0.82);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.4rem;
    filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.5));
}

.version-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    background: var(--cyan-dim);
    border: 1px solid var(--cyan-border);
    color: var(--cyan);
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    margin-left: 0.3rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.1rem;
}

.nav {
    display: flex;
    gap: 0.9rem;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    white-space: nowrap;
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

/* Language Switcher */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.3rem 0.7rem;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-weight: 600;
    transition: color 0.2s;
}

.lang-btn.active {
    color: var(--cyan);
}

.lang-divider {
    color: var(--border-color);
}

/* GitHub Button */
.github-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.4rem 0.9rem;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
}

.github-btn:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    padding: 6.5rem 0 5rem;
    text-align: center;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--cyan-dim);
    border: 1px solid var(--cyan-border);
    color: var(--cyan);
    padding: 0.4rem 1.1rem;
    border-radius: 20px;
    font-size: 0.82rem;
    font-family: var(--font-mono);
    margin-bottom: 2rem;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.08);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--cyan);
}

.badge-dot.pulse {
    animation: pulseGlow 2.4s infinite;
}

@keyframes pulseGlow {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 242, 254, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(0, 242, 254, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 242, 254, 0); }
}

.hero-title {
    font-size: 3.4rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.hero-desc {
    max-width: 840px;
    margin: 0 auto 3rem;
    color: var(--text-secondary);
    font-size: 1.12rem;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    justify-content: center;
    margin-bottom: 3.5rem;
}

.code-box {
    background: #0A0D14;
    border: 1px solid var(--border-color);
    padding: 0.9rem 1.4rem;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.92rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.prompt {
    color: var(--cyan);
    font-weight: 700;
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.3rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.copy-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.hero-highlights {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.8rem;
}

.hl-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(14, 18, 27, 0.7);
    border: 1px solid var(--border-color);
    padding: 0.45rem 0.9rem;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Sections */
.section {
    padding: 5.5rem 0;
    border-top: 1px solid var(--border-color);
}

.section-title {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-title h2 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.6rem;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 680px;
    margin: 0 auto;
}

/* Terminals */
.terminal-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.8rem;
}

.term-card {
    background: #0A0D14;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 32px rgba(0, 0, 0, 0.5);
}

.term-header {
    background: #111520;
    padding: 0.75rem 1.1rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.term-dots {
    display: flex;
    gap: 7px;
}

.term-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.d-red { background: #EF4444; }
.d-yellow { background: #F59E0B; }
.d-green { background: #10B981; }

.term-name {
    margin-left: 0.9rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
}

.term-content {
    padding: 1.3rem;
    font-family: var(--font-mono);
    font-size: 0.83rem;
    line-height: 1.65;
}

.t-line { margin-bottom: 0.35rem; }
.t-prompt { color: var(--cyan); font-weight: 700; }
.t-dim { color: var(--text-muted); }
.t-cyan { color: var(--cyan); }
.t-white { color: var(--text-primary); }
.t-yellow { color: var(--yellow); }
.t-green { color: var(--green); font-weight: 600; }

.term-cursor {
    display: inline-block;
    width: 8px;
    height: 15px;
    background: var(--cyan);
    margin-left: 4px;
    vertical-align: middle;
    animation: blinkCursor 1s step-end infinite;
}

@keyframes blinkCursor {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Recipes Section */
.recipes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
}

.recipe-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1.8rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.2s ease;
}

.recipe-card:hover {
    border-color: var(--cyan-border);
    transform: translateY(-2px);
}

.recipe-header {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    margin-bottom: 0.8rem;
}

.recipe-num {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--cyan);
    opacity: 0.85;
}

.recipe-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.35;
}

.recipe-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 1.5rem;
}

.recipe-code-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.recipe-code-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

.recipe-box {
    padding: 0.65rem 0.9rem;
    font-size: 0.78rem;
    justify-content: space-between;
}

.recipe-box code {
    word-break: break-all;
    color: var(--cyan);
}

/* Authentic IETF RFC Document Styling */
.rfc-doc-box {
    background: #090C12;
    border: 1px solid var(--cyan-border);
    border-radius: 12px;
    padding: 2.2rem;
    font-family: var(--font-mono);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
}

.rfc-doc-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 1.2rem;
}

.rfc-meta-right {
    text-align: right;
}

.rfc-divider {
    color: var(--border-color);
    font-size: 0.75rem;
    margin-bottom: 1.8rem;
    overflow: hidden;
    white-space: nowrap;
}

.rfc-main-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--cyan);
    text-align: center;
    margin-bottom: 2rem;
}

.rfc-section-body {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.rfc-sec-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4rem;
}

.rfc-para {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.rfc-ascii-diagram {
    background: #05070B;
    border: 1px solid var(--border-color);
    padding: 1.4rem;
    border-radius: 8px;
    color: var(--cyan);
    font-size: 0.78rem;
    line-height: 1.35;
    overflow-x: auto;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
}

.rfc-table {
    margin-top: 1rem;
}

.rfc-table th {
    background: #111520;
}

/* Security Grid */
.security-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.8rem;
}

.sec-card {
    border-radius: 14px;
    padding: 2.2rem;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
}

.sec-does {
    background: rgba(16, 185, 129, 0.03);
    border-color: var(--green-border);
}

.sec-doesnot {
    background: rgba(239, 68, 68, 0.03);
    border-color: var(--red-border);
}

.sec-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.sec-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
}

.sec-does .sec-icon { background: var(--green-dim); color: var(--green); }
.sec-doesnot .sec-icon { background: var(--red-dim); color: var(--red); }

.sec-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

.sec-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.sec-list code {
    font-family: var(--font-mono);
    color: var(--cyan);
    background: var(--cyan-dim);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
}

/* Specs Grid */
.spec-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
}

.spec-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.2s ease;
}

.spec-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.spec-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--cyan);
    text-transform: uppercase;
    margin-bottom: 0.6rem;
    font-weight: 600;
}

.spec-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.spec-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* Documentation Section */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.8rem;
}

.docs-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 12px;
}

.docs-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    color: var(--text-primary);
    font-weight: 700;
}

.doc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.doc-table th {
    text-align: left;
    padding: 0.7rem 0.9rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
}

.doc-table td {
    padding: 0.8rem 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
}

.doc-table tr:hover td {
    background: rgba(255, 255, 255, 0.015);
}

.doc-table code {
    font-family: var(--font-mono);
    color: var(--cyan);
    background: var(--cyan-dim);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.82rem;
}

.table-wrapper {
    overflow-x: auto;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 2.8rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Responsive Breakdown */
@media (max-width: 1024px) {
    .spec-grid, .recipes-grid, .security-grid, .docs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .terminal-container, .spec-grid, .recipes-grid, .security-grid, .docs-grid {
        grid-template-columns: 1fr;
    }
    .rfc-doc-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    .rfc-meta-right {
        text-align: left;
    }
    .hero-title { font-size: 2.4rem; }
    .header-right { gap: 1rem; }
    .nav { display: none; }
    .footer-inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* PQC Compliance Section Styling */
.compliance-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.compliance-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.75rem;
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}

.compliance-card:hover {
    border-color: var(--cyan-border);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 242, 254, 0.05);
}

.compliance-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.compliance-flag {
    font-size: 2rem;
    line-height: 1;
}

.compliance-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.compliance-sub {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--cyan);
    display: block;
}

.compliance-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.compliance-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.c-tag {
    font-family: var(--font-mono);
    font-size: 0.725rem;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    background: var(--cyan-dim);
    border: 1px solid var(--cyan-border);
    color: var(--cyan);
}

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