:root {
    --bg-primary: #090d16;
    --bg-secondary: #0f172a;
    --bg-card: #1e293b;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --success: #10b981;
    --warning: #f59e0b;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-icon {
    font-size: 24px;
}
.logo-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.5px;
}
.highlight {
    color: var(--accent);
}
.version-tag {
    font-size: 11px;
    background: #0284c7;
    color: #fff;
    padding: 2px 8px;
    border-radius: 999px;
    font-weight: 600;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}
.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}
.nav-item:hover, .nav-item.active {
    color: var(--text-primary);
}
.nav-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 14px;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
}
.nav-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Hero */
.hero {
    text-align: center;
    padding: 40px 0 25px;
}
.hero h1 {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 12px;
}
.gradient-text {
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 650px;
    margin: 0 auto;
}

/* Terminal Card */
.terminal-card {
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
    margin-bottom: 30px;
    position: relative;
}
.terminal-header {
    background: #161b22;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #30363d;
}
.terminal-dots {
    display: flex;
    gap: 6px;
}
.dot {
    width: 11px;
    height: 11px;
    border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }
.terminal-title {
    font-size: 13px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}
.btn-copy {
    background: #21262d;
    border: 1px solid #30363d;
    color: #c9d1d9;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}
.btn-copy:hover {
    background: #30363d;
    border-color: #8b949e;
    color: #fff;
}
.terminal-body {
    padding: 20px;
    overflow-x: auto;
}
.command-line {
    font-family: var(--font-mono);
    font-size: 15px;
    line-height: 1.6;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}
.prompt {
    color: var(--success);
    user-select: none;
    font-weight: bold;
}
code {
    color: #58a6ff;
    word-break: break-all;
}
.toast {
    position: absolute;
    bottom: 12px;
    right: 20px;
    background: var(--success);
    color: #fff;
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.2s;
    pointer-events: none;
}
.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Grid Layout */
.grid-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 24px;
    margin-bottom: 40px;
}
@media (max-width: 960px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }
}

/* Card Styles */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}
.card-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.card-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* Preset Buttons Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
}
.preset-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 14px;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.preset-btn:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.preset-btn.active {
    background: rgba(14, 165, 233, 0.12);
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}
.p-icon {
    font-size: 20px;
    margin-bottom: 4px;
}
.p-name {
    font-weight: 700;
    font-size: 14px;
    color: var(--text-primary);
}
.p-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Form Controls */
.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}
.flex-1 { flex: 1; }
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}
label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}
.input-text, .select-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}
.input-text:focus, .select-box:focus {
    outline: none;
    border-color: var(--accent);
}
.range-slider {
    accent-color: var(--accent);
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 4px;
    cursor: pointer;
}
.range-val {
    font-size: 12px;
    color: var(--accent);
    font-weight: 700;
    margin-left: 8px;
}

/* Explainer List */
.explainer-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.explainer-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 13px;
}
.flag-badge {
    display: inline-block;
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-weight: 600;
    margin-right: 8px;
}

/* Quick Tips */
.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.tips-list li {
    font-size: 13px;
    color: var(--text-secondary);
    position: relative;
    padding-left: 18px;
}
.tips-list li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: var(--accent);
    font-size: 16px;
}
.tips-list code {
    background: #111827;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
}

/* Donation Card */
.donation-card {
    background: linear-gradient(145deg, #1e293b, #0f172a);
    border: 1px solid #0284c7;
}
.donation-header {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}
.gift-icon {
    font-size: 28px;
}
.donation-header h3 {
    font-size: 15px;
    color: #f8fafc;
}
.donation-header p {
    font-size: 12px;
    color: #94a3b8;
}
.donation-hint {
    font-size: 12px;
    color: #cbd5e1;
    margin-bottom: 10px;
}
.donation-copy-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #0f172a;
    border: 1px dashed #38bdf8;
    padding: 8px 12px;
    border-radius: 6px;
    margin-bottom: 10px;
}
.donation-email {
    font-family: var(--font-mono);
    font-size: 12px;
    color: #38bdf8;
}
.btn-copy-sm {
    background: #0284c7;
    border: none;
    color: #fff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    cursor: pointer;
    font-weight: 600;
}
.btn-amazon-donate {
    display: block;
    text-align: center;
    background: #f59e0b;
    color: #0f172a;
    text-decoration: none;
    font-weight: 700;
    font-size: 13px;
    padding: 10px;
    border-radius: 6px;
    transition: opacity 0.2s;
}
.btn-amazon-donate:hover {
    opacity: 0.9;
}

/* Adsterra Wrapper */
.ad-wrapper {
    margin: 40px 0;
    text-align: center;
}
.ad-container {
    display: inline-block;
    min-height: 90px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 4px;
    max-width: 100%;
    overflow-x: auto;
}
.ad-caption {
    font-size: 11px;
    color: #64748b;
    margin-top: 6px;
}

/* Tool Matrix Cross Links */
.tool-matrix {
    margin: 40px auto 20px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-align: center;
}
.matrix-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
    display: block;
}
.matrix-links {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}
.matrix-badge {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.matrix-badge:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}
.matrix-badge.active {
    border-color: var(--accent);
    background: rgba(56, 189, 248, 0.1);
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 13px;
}