/* CSS Variables */
:root {
    --bg-color: #0d1117;
    --grid-color: rgba(255, 255, 255, 0.05);
    --text-color: #c9d1d9;
    --text-muted: #8b949e;
    --subheadline-color: #8b949e;
    --secondary-text: #8b949e;
    --license-color: #484f58;
    --surface-muted: rgba(13, 17, 23, 0.90);
    --accent: #10b981;
    --accent-hover: #34d399;
    --card-bg: #161b22;
    --card-hover-bg: #21262d;
    --border-color: #30363d;
    --border-strong: #484f58;
    --link-hover: #34d399;
    --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', Consolas, Monaco, monospace;
    --transition-speed: 0.3s;
}

:root[data-theme="light"] {
    --bg-color: #f6f8fa;
    --grid-color: rgba(0, 0, 0, 0.05);
    --text-color: #24292f;
    --text-muted: #57606a;
    --subheadline-color: #57606a;
    --secondary-text: #57606a;
    --license-color: #6e7781;
    --surface-muted: rgba(246, 248, 250, 0.90);
    --card-bg: #ffffff;
    --card-hover-bg: #f3f4f6;
    --border-color: #d0d7de;
    --border-strong: #afb8c1;
    --link-hover: #059669;
    --accent: #10b981;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(var(--grid-color) 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--text-color);
    font-family: var(--font-stack);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

main {
    flex: 1;
}

/* Typography */
h1,
h2,
h3 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.04em;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
}

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    transition: color var(--transition-speed), border-color var(--transition-speed);
}

a:hover {
    color: var(--link-hover);
    border-color: var(--link-hover);
}

code {
    font-family: var(--font-mono);
    background-color: var(--card-bg);
    color: var(--accent);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    border: 1px solid var(--border-color);
}

/* Utilities */
.text-center {
    text-align: center;
}

/* Layout Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 4vw;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
}

/* Header & Nav */
.main-header {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--surface-muted);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-mono);
    border: none;
    color: var(--text-color);
    letter-spacing: -0.05em;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo:hover {
    color: var(--accent);
    border: none;
}

.icon-img {
    height: 32px;
    width: auto;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    border: none;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: lowercase;
}

.nav-links a.active {
    color: var(--accent);
}

.theme-switcher {
    display: flex;
    align-items: center;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0;
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
}

.theme-toggle:hover {
    background-color: var(--card-bg);
    color: var(--text-color);
    border-color: var(--border-strong);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Mobile Menu Button */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition-speed);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
    .nav-wrapper {
        gap: 0.75rem;
    }

    .logo {
        margin-right: auto;
    }

    .menu-toggle {
        display: flex;
        order: 3;
    }

    .nav-controls {
        order: 2;
        gap: 0.75rem;
    }

    #nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-color);
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }

    #nav-menu.show {
        display: block;
    }

    .nav-links {
        flex-direction: column;
        align-items: flex-end;
        gap: 1.5rem;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 6px;
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    border: none;
    transition: transform var(--transition-speed), background-color var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
}

.btn:hover {
    transform: translateY(-2px);
    border: none;
}

.btn-primary {
    background-color: var(--accent);
    color: #000000 !important;
}

:root[data-theme="light"] .btn-primary {
    color: #ffffff !important;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

/* Split Hero Section */
.hero-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding-top: 8rem;
    padding-bottom: 6rem;
}

.hero-content {
    max-width: 600px;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-content .subheadline {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 3rem;
    color: var(--text-muted);
}

.cta-group {
    display: flex;
    gap: 1.25rem;
}

/* Mock Editor */
.hero-visual {
    position: relative;
    width: 100%;
}

.mock-editor {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    overflow: hidden;
}

.editor-header {
    background-color: var(--border-color);
    padding: 0.75rem 1rem;
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.dot.red { background-color: #ff5f56; }
.dot.yellow { background-color: #ffbd2e; }
.dot.green { background-color: #27c93f; }

.editor-body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-color);
    line-height: 1.6;
    min-height: 220px;
}

.typing-line {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.prompt {
    color: var(--accent);
    margin-right: 0.75rem;
    font-weight: bold;
}

.cursor {
    display: inline-block;
    width: 8px;
    height: 1.1em;
    background-color: var(--text-color);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
}

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

.typed-text::before {
    content: "";
    animation: typing 8s infinite;
}

@keyframes typing {
    0%, 10% { content: ""; }
    12% { content: "/"; }
    14% { content: "/s"; }
    16% { content: "/si"; }
    18% { content: "/sig"; }
    22%, 100% { content: ""; display: none; }
}

.expanded-text {
    opacity: 0;
    animation: expand 8s infinite;
}

@keyframes expand {
    0%, 21% { opacity: 0; display: none; }
    22%, 90% { opacity: 1; display: block; }
    100% { opacity: 0; display: none; }
}

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

/* Features Bento Box */
.features {
    padding-top: 4rem;
    padding-bottom: 6rem;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: minmax(200px, auto);
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--border-strong);
    border-radius: 8px;
    padding: 2rem;
    position: relative;
    transition: transform var(--transition-speed), border-color var(--transition-speed), background-color var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
}

.card::before {
    content: "● ● ●";
    position: absolute;
    top: 0.5rem;
    left: 1rem;
    font-size: 0.6rem;
    letter-spacing: 2px;
    color: var(--border-strong);
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-color);
    border-top-color: var(--accent);
    background-color: var(--card-hover-bg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card:hover::before {
    color: var(--text-muted);
}

.card h3 {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--text-color);
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.card p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0;
    flex: 1;
}

.bento-large {
    grid-column: span 2;
    grid-row: span 2;
}

.bento-wide {
    grid-column: span 2;
}

.snippet-visual {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

/* Trust Banner */
.trust-banner {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 4rem 0;
    margin-bottom: 4rem;
}

.trust-wrapper {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
}

.trust-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    flex: 1;
}

.trust-icon {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 1.5rem;
    font-weight: bold;
    margin-top: 0.2rem;
}

.trust-text h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.trust-text p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Structural Responsiveness */
@media (max-width: 992px) {
    .hero-split {
        grid-template-columns: 1fr;
        gap: 4rem;
        padding-top: 6rem;
    }
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .bento-wide {
        grid-column: span 2;
    }
    .trust-wrapper {
        flex-direction: column;
        gap: 2.5rem;
    }
}

@media (max-width: 768px) {
    .bento-grid {
        grid-template-columns: 1fr;
    }
    .bento-large, .bento-wide {
        grid-column: span 1;
        grid-row: auto;
    }
    .cta-group {
        flex-direction: column;
    }
}

/* Text Pages (Privacy, Support, Posts) */
.text-page {
    padding-top: 6rem;
    padding-bottom: 6rem;
    max-width: 800px;
}

.text-page h1 {
    font-size: 3rem;
    margin-bottom: 0.75rem;
}

.text-page .last-updated,
.post-date {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: 4rem;
}

.text-page h2 {
    font-size: 1.75rem;
    margin-top: 3.5rem;
    margin-bottom: 1.25rem;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.text-page h3 {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.text-page p {
    margin-bottom: 1.5rem;
}

.text-page ul,
.text-page ol {
    margin-bottom: 2rem;
    padding-left: 1.5rem;
    color: var(--text-muted);
}

.text-page li {
    margin-bottom: 0.75rem;
}

.text-page hr {
    border: 0;
    height: 1px;
    background-color: var(--border-color);
    margin: 4rem 0;
}

.faq-item {
    margin-bottom: 3rem;
}

.faq-item h3 {
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.faq-item p {
    color: var(--text-muted);
}

.highlight-box {
    background-color: var(--card-bg);
    border-left: 4px solid var(--accent);
    padding: 1.5rem;
    border-radius: 0 6px 6px 0;
    margin-top: 2rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

/* News */
.post-tile {
    text-decoration: none;
    border: none;
    display: flex;
    flex-direction: column;
}

.post-meta {
    font-family: var(--font-mono);
    margin-bottom: 1rem;
    color: var(--accent);
    font-size: 0.85rem;
}

.post-link {
    margin-top: auto;
    padding-top: 1.5rem;
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-link::after {
    content: "→";
    transition: transform var(--transition-speed);
}

.post-tile:hover .post-link::after {
    transform: translateX(4px);
}

/* Footer */
footer.container {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 1.5rem;
    background-color: var(--bg-color);
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-links a,
.footer-links .copyright {
    font-family: var(--font-mono);
    color: var(--subheadline-color);
    font-size: 0.9rem;
    border: none;
}

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

.license {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--license-color);
}

/* Sticky back-to-top button */
#back-to-top {
    position: fixed;
    bottom: 2.5rem;
    right: 2.5rem;
    background-color: var(--surface-muted);
    backdrop-filter: blur(8px);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    width: 44px;
    height: 44px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed), visibility var(--transition-speed), transform var(--transition-speed), background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
    font-family: var(--font-mono);
    font-size: 1.2rem;
}

#back-to-top.show {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background-color: var(--card-bg);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-4px);
}

@media (max-width: 768px) {
    #back-to-top {
        bottom: 2rem;
        right: 2rem;
    }
}