/* ===== COMMON STYLES - LevelUP ===== */
/* Shared styles for header, footer, theme, background effects */

:root {
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --space-unit: 8px;
}

/* ===== DARK THEME (default) ===== */
[data-theme="dark"] {
    --color-bg: #0c0c0c;
    --color-surface: #141414;
    --color-surface-elevated: #1a1a1a;
    --color-border: #262626;
    --color-border-hover: #404040;
    --color-accent: #22c55e;
    --color-accent-dim: #16a34a;
    --color-accent-glow: rgba(34, 197, 94, 0.15);
    --color-accent-subtle: rgba(34, 197, 94, 0.08);
    --color-text: #fafafa;
    --color-text-secondary: #a1a1a1;
    --color-text-muted: #525252;
    --header-bg: rgba(12, 12, 12, 0.9);
    --grid-color: rgba(34, 197, 94, 0.03);
    --shadow-color: rgba(0, 0, 0, 0.5);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
    --color-bg: #f7f6f3;
    --color-surface: #ffffff;
    --color-surface-elevated: #f0efec;
    --color-border: #e2e1de;
    --color-border-hover: #c5c4c0;
    --color-accent: #15803d;
    --color-accent-dim: #166534;
    --color-accent-glow: rgba(21, 128, 61, 0.12);
    --color-accent-subtle: rgba(21, 128, 61, 0.06);
    --color-text: #1a1a1a;
    --color-text-secondary: #555555;
    --color-text-muted: #888888;
    --header-bg: rgba(247, 246, 243, 0.92);
    --grid-color: rgba(21, 128, 61, 0.04);
    --shadow-color: rgba(0, 0, 0, 0.08);
}

/* ===== RESET ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-display);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

/* ===== BACKGROUND EFFECTS ===== */
.bg-grid {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: -2;
    animation: grid-drift 20s linear infinite;
}

@keyframes grid-drift {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

.scan-line {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, var(--color-accent) 50%, transparent 100%);
    opacity: 0.12;
    z-index: 1000;
    animation: scan 8s linear infinite;
    pointer-events: none;
}

@keyframes scan {
    0% { transform: translateY(-100%); opacity: 0; }
    5% { opacity: 0.12; }
    95% { opacity: 0.12; }
    100% { transform: translateY(100vh); opacity: 0; }
}

.glow-orb {
    position: fixed;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    filter: blur(40px);
    animation: orb-pulse 6s ease-in-out infinite;
}

@keyframes orb-pulse {
    0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.6; transform: translateX(-50%) scale(1.1); }
}

/* ===== HEADER ===== */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}

nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-text);
    transition: all 0.3s ease;
}

.logo:hover { color: var(--color-accent); }
.logo:hover .logo-icon rect,
.logo:hover .logo-icon path {
    stroke: var(--color-accent);
    filter: drop-shadow(0 0 8px var(--color-accent-glow));
}

.logo-icon {
    width: 32px;
    height: 32px;
    transition: all 0.3s ease;
}

.logo-icon rect,
.logo-icon path {
    stroke: currentColor;
    transition: all 0.3s ease;
}

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

/* ===== NAVIGATION ===== */
.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

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

.nav-links a,
.nav-links li a {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
    position: relative;
}

.nav-links a::before,
.nav-links li a::before {
    content: './';
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links li a:hover {
    color: var(--color-accent);
}

.nav-links a:hover::before,
.nav-links li a:hover::before {
    color: var(--color-accent);
}

/* Underline animation */
.nav-links a::after,
.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-links a:hover::after,
.nav-links li a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Active state */
.nav-links a.active,
.nav-links li a.active {
    color: var(--color-accent);
}

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

.nav-links a.active::after,
.nav-links li a.active::after {
    transform: scaleX(1);
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-glow);
}

.theme-toggle:hover .theme-icon {
    transform: rotate(15deg) scale(1.1);
}

.theme-icon {
    width: 20px;
    height: 20px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-icon .bulb-outline {
    stroke: var(--color-text-muted);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-icon .bulb-glow {
    fill: transparent;
    stroke: none;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-icon .light-rays {
    stroke: var(--color-text-muted);
    opacity: 0;
    transform: scale(0.8);
    transform-origin: center;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light mode - bulb is ON */
[data-theme="light"] .theme-icon .bulb-outline {
    stroke: var(--color-accent);
    filter: drop-shadow(0 0 4px var(--color-accent-glow));
}

[data-theme="light"] .theme-icon .bulb-glow {
    fill: var(--color-accent);
    opacity: 0.3;
}

[data-theme="light"] .theme-icon .light-rays {
    stroke: var(--color-accent);
    opacity: 1;
    transform: scale(1);
}

/* ===== MOBILE MENU ===== */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .menu-toggle { display: flex; }
    nav { padding: 0.875rem 1.5rem; }
}

/* ===== FOOTER ===== */
footer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

footer a,
.footer-legal {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover,
.footer-legal:hover {
    color: var(--color-accent);
}

.footer-stack {
    display: flex;
    gap: 1rem;
}

.footer-stack span {
    color: var(--color-text-secondary);
}

/* ===== CTA SECTION ===== */
.cta-section {
    max-width: 800px;
    margin: 4rem auto;
    padding: 3rem;
    text-align: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top, var(--color-accent-glow) 0%, transparent 60%);
    pointer-events: none;
}

.cta-section h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.cta-section p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.cta-section .btn,
.cta-section a.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    background: var(--color-accent);
    color: #000;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cta-section .btn:hover,
.cta-section a.btn:hover {
    background: var(--color-accent-dim);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--color-accent-glow);
}