/* DEFAULT THEME: DARK */
:root {
    --bg-color: #0B1120;
    --text-color: #e2e8f0;
    --header-bg: rgba(11, 17, 32, 0.7);
    --card-bg: #1e293b;
    --card-border: #334155;
    --link-color: #93c5fd;
    --link-hover-color: #60a5fa;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --card-shadow-hover: 0 0 20px rgba(59, 130, 246, 0.3);
    --mobile-menu-bg: #111827;
    --mobile-menu-hover-bg: #374151;
    --dropdown-bg: #1e293b;
    --dropdown-hover-bg: #334155;
}

/* LIGHT THEME OVERRIDES */
body.light-theme {
    --bg-color: #f8fafc;
    --text-color: #1f2937;
    --header-bg: rgba(255, 255, 255, 0.7);
    --card-bg: #ffffff;
    --card-border: #e5e7eb;
    --link-color: #1d4ed8;
    --link-hover-color: #2563eb;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 0 20px rgba(59, 130, 246, 0.2);
    --mobile-menu-bg: #f9fafb;
    --mobile-menu-hover-bg: #f3f4f6;
    --dropdown-bg: #ffffff;
    --dropdown-hover-bg: #f3f4f6;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#header {
    background-color: var(--header-bg);
}

#header a,
#header button {
    color: var(--text-color);
}

#header nav a:hover {
    color: var(--link-hover-color);
}

#header button:hover {
    background-color: var(--card-bg);
}

#mobile-menu {
    background-color: var(--mobile-menu-bg);
    border-top: 1px solid var(--card-border);
}

#mobile-menu a {
    color: var(--text-color);
}

#mobile-menu a:hover {
    background-color: var(--mobile-menu-hover-bg);
}

#language-dropdown {
    background-color: var(--dropdown-bg);
    border: 1px solid var(--card-border);
}

#language-dropdown a {
    color: var(--text-color);
}

#language-dropdown a:hover {
    background-color: var(--dropdown-hover-bg);
}

.card-item {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -2px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-item:hover {
    transform: translateY(-0.5rem);
    box-shadow: var(--card-shadow-hover);
}

.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

#hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -1;
    transform: translateX(-50%) translateY(-50%);
    background-size: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(11, 17, 32, 0.8);
    z-index: 0;
}

.terminal-font {
    font-family: 'Roboto Mono', monospace;
}

.terminal-cursor::after {
    content: '█';
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

.gradient-text {
    background: linear-gradient(to right, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

body.light-theme .gradient-text {
    background: linear-gradient(to right, #2563eb, #1d4ed8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}