/* ===== Design Tokens ===== */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    --bg-body: #0a0a10;
    --bg-surface: #12121a;
    --bg-elevated: #1a1a26;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.06);

    --accent-primary: #6c63ff;
    --accent-primary-light: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #6c63ff 0%, #a78bfa 100%);
    --accent-glow: rgba(108, 99, 255, 0.25);

    --color-success: #34d399;
    --color-success-dim: rgba(52, 211, 153, 0.12);
    --color-danger: #f87171;
    --color-danger-dim: rgba(248, 113, 113, 0.12);
    --color-warning: #fbbf24;
    --color-warning-dim: rgba(251, 191, 36, 0.12);
    --color-info: #60a5fa;
    --color-info-dim: rgba(96, 165, 250, 0.12);

    --text-primary: #e8e8ed;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.10);

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 24px var(--accent-glow);

    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);

    --bg-terminal: #0c0c0c;
    --bg-navbar: rgba(10, 10, 16, 0.75);
    --scrollbar-thumb: rgba(255, 255, 255, 0.1);
    --scrollbar-thumb-hover: rgba(255, 255, 255, 0.18);
}

/* ===== Light Mode ===== */
[data-theme="light"] {
    --bg-body: #f4f5f7;
    --bg-surface: #ffffff;
    --bg-elevated: #f0f0f4;
    --bg-glass: rgba(0, 0, 0, 0.02);
    --bg-glass-hover: rgba(0, 0, 0, 0.05);

    --accent-primary: #5b52e0;
    --accent-primary-light: #7c6ef0;
    --accent-gradient: linear-gradient(135deg, #5b52e0 0%, #7c6ef0 100%);
    --accent-glow: rgba(91, 82, 224, 0.18);

    --color-success: #059669;
    --color-success-dim: rgba(5, 150, 105, 0.08);
    --color-danger: #dc2626;
    --color-danger-dim: rgba(220, 38, 38, 0.08);
    --color-warning: #d97706;
    --color-warning-dim: rgba(217, 119, 6, 0.08);
    --color-info: #2563eb;
    --color-info-dim: rgba(37, 99, 235, 0.08);

    --text-primary: #1a1a2e;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;

    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-medium: rgba(0, 0, 0, 0.12);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);
    --shadow-glow: 0 0 24px var(--accent-glow);

    --bg-terminal: #1e1e2e;
    --bg-navbar: rgba(255, 255, 255, 0.8);
    --scrollbar-thumb: rgba(0, 0, 0, 0.12);
    --scrollbar-thumb-hover: rgba(0, 0, 0, 0.22);
}

/* ===== Global Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    transition: background-color 0.35s ease, color 0.35s ease;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

/* ===== Navbar ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    height: 64px;
    background: var(--bg-navbar);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--border-subtle);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-brand {
    font-size: 18px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-right: 24px;
    letter-spacing: -0.02em;
}

.navbar a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    position: relative;
}

.navbar a:hover {
    color: var(--text-primary);
    background: var(--bg-glass-hover);
}

.navbar a.active {
    color: var(--accent-primary-light);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-right .btn-nav-accent {
    background: var(--accent-gradient);
    color: #fff !important;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.01em;
    transition: var(--transition);
}

.nav-right .btn-nav-accent:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
    background: var(--bg-glass-hover);
}

/* ===== Auth Visibility ===== */
.auth-only { display: none; }
.guest-only { display: block; }

/* Fix inline display for nav items */
.navbar .auth-only,
.navbar .guest-only {
    display: none;
}
.navbar .guest-only {
    display: inline-flex;
}

/* ===== Container ===== */
.container {
    padding: 32px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 1.75rem; font-weight: 600; }
h3 { font-size: 1.25rem; font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; }

/* ===== Card ===== */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.4;
    white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
    box-shadow: 0 4px 24px var(--accent-glow);
}

.btn-success {
    background: linear-gradient(135deg, #059669, #34d399);
    color: #fff;
    box-shadow: 0 2px 12px rgba(52, 211, 153, 0.2);
}
.btn-success:hover {
    box-shadow: 0 4px 24px rgba(52, 211, 153, 0.3);
}

.btn-ghost {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}
.btn-ghost:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-medium);
}

.btn-danger {
    background: linear-gradient(135deg, #dc2626, #f87171);
    color: #fff;
}

.btn-info {
    background: linear-gradient(135deg, #2563eb, #60a5fa);
    color: #fff;
}

.btn-purple {
    background: linear-gradient(135deg, #7c3aed, #a78bfa);
    color: #fff;
    box-shadow: 0 2px 12px rgba(124, 58, 237, 0.25);
}
.btn-purple:hover {
    box-shadow: 0 4px 24px rgba(124, 58, 237, 0.35);
}

.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }

/* ===== Inputs ===== */
input[type="text"],
input[type="password"],
input[type="email"],
select,
textarea {
    font-family: var(--font-sans);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    padding: 11px 14px;
    outline: none;
    transition: var(--transition);
    width: 100%;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder { color: var(--text-muted); }

label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 8px var(--accent-glow); }
    50% { box-shadow: 0 0 24px var(--accent-glow); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.animate-in {
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }

/* ===== Theme Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-full);
    background: var(--bg-glass);
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition);
    margin-left: 4px;
    flex-shrink: 0;
    line-height: 1;
    padding: 0;
}

.theme-toggle:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-primary);
    transform: rotate(20deg);
    box-shadow: var(--shadow-glow);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    transition: opacity 0.25s ease, transform 0.35s ease;
    position: absolute;
}

/* Dark mode (default): show moon, hide sun */
.theme-toggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* Light mode: show sun, hide moon */
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 0 16px;
        height: 56px;
    }
    .nav-brand { font-size: 16px; margin-right: 12px; }
    .navbar a { font-size: 13px; padding: 6px 10px; }
    .container { padding: 20px 16px; }
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.4rem; }
}

@media (max-width: 480px) {
    .navbar { flex-wrap: wrap; height: auto; padding: 12px 16px; gap: 8px; }
    .nav-left, .nav-right { width: 100%; justify-content: center; }
}