/* ---------- Dark Mode Base with CSS Variables ---------- */
:root {
    /* Light mode colors */
    --bg-gradient-start: #f0f0f0;
    --bg-gradient-end: #dcdcdc;
    --text-color: #222;
    --navbar-bg-start: #eee;
    --navbar-bg-end: #ccc;
    --navbar-text-color: #444;
    --navbar-text-hover: #aa8800;
    --form-bg: rgba(255, 255, 255, 0.9);
    --input-bg: #fff;
    --input-border: #ccc;
    --input-text: #222;
    --input-focus-border: #aa8800;
    --button-primary-bg: #aa8800;
    --button-primary-border: #aa8800;
    --button-primary-text: #fff;
    --button-primary-hover-bg: #886600;
    --button-primary-hover-border: #886600;
    --button-secondary-bg: #ddd;
    --button-secondary-border: #ddd;
    --button-secondary-text: #444;
    --button-secondary-hover-bg: #ccc;
    --button-secondary-hover-border: #ccc;
    --table-bg: rgba(255, 255, 255, 0.95);
    --table-header-bg: #eee;
    --table-header-text: #aa8800;
    --table-row-hover-bg: rgba(170, 136, 0, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --text-shadow-color: rgba(0,0,0,0.1);
    --grain-opacity: 0.05;
}

body.dark-mode {
    /* Dark mode colors */
    --bg-gradient-start: #1a1a1a;
    --bg-gradient-end: #111111;
    --text-color: #ddd;
    --navbar-bg-start: #111;
    --navbar-bg-end: #222;
    --navbar-text-color: #ccc;
    --navbar-text-hover: #ffcc00;
    --form-bg: rgba(30, 30, 30, 0.9);
    --input-bg: #222;
    --input-border: #555;
    --input-text: #eee;
    --input-focus-border: #ffcc00;
    --button-primary-bg: #ffcc00;
    --button-primary-border: #ffcc00;
    --button-primary-text: #111;
    --button-primary-hover-bg: #e6b800;
    --button-primary-hover-border: #e6b800;
    --button-secondary-bg: #333;
    --button-secondary-border: #333;
    --button-secondary-text: #eee;
    --button-secondary-hover-bg: #222;
    --button-secondary-hover-border: #222;
    --table-bg: rgba(25, 25, 25, 0.95);
    --table-header-bg: #222;
    --table-header-text: #ffcc00;
    --table-row-hover-bg: rgba(255, 204, 0, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --text-shadow-color: rgba(0,0,0,0.5);
    --grain-opacity: 0.07;
}

/* ---------- Base Styles ---------- */
body {
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    font-family: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: var(--text-color);
    position: relative;
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ---------- Cinematic Grain Overlay ---------- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjxmaWx0ZXIgaWQ9Im5vaXNlIj48ZmVHYXVzc2lhbkJsdXIgc3RkRGV2aWF0aW9uPSIxIi8+PC9maWx0ZXI+PHJlY3Qgd2lkdGg9IjEiIGhlaWdodD0iMSIgZmlsdGVyPSJ1cmwoI25vaXNlKSIgLz48L3N2Zz4=');
    opacity: var(--grain-opacity);
    z-index: 9999;
    animation: grainAnim 3s infinite;
    transition: opacity 0.3s ease;
}

@keyframes grainAnim {
    0% { transform: translate(0,0); }
    25% { transform: translate(1px, -1px); }
    50% { transform: translate(-1px, 1px); }
    75% { transform: translate(1px, 1px); }
    100% { transform: translate(0,0); }
}

/* ---------- Navbar ---------- */
.navbar {
    background: linear-gradient(90deg, var(--navbar-bg-start), var(--navbar-bg-end));
    box-shadow: 0 3px 10px var(--shadow-color);
    backdrop-filter: blur(4px);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar-brand {
    font-weight: bold;
    letter-spacing: 2px;
    color: var(--navbar-text-hover) !important;
    transition: color 0.3s ease;
}

.nav-link {
    color: var(--navbar-text-color) !important;
    transition: all 0.3s ease;
}

.nav-link.active, .nav-link:hover {
    color: var(--navbar-text-hover) !important;
    text-shadow: 0 2px 4px var(--text-shadow-color);
    transform: translateY(-1px);
}

/* ---------- Container & Forms ---------- */
.container {
    padding: 50px 20px;
    transition: padding 0.3s ease;
}

h2 {
    text-shadow: 0 2px 5px var(--text-shadow-color);
    margin-bottom: 30px;
    font-weight: 600;
    transition: text-shadow 0.3s ease;
}

form {
    background: var(--form-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 25px var(--shadow-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.3s ease;
}

form:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px var(--shadow-color);
}

/* ---------- Inputs ---------- */
input.form-control {
    border-radius: 8px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--input-text);
    transition: all 0.3s ease;
}

input.form-control:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 8px var(--input-focus-border);
    outline: none;
}

/* ---------- Buttons ---------- */
.btn {
    border-radius: 8px;
    box-shadow: 0 3px 8px var(--shadow-color);
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--button-primary-bg);
    border-color: var(--button-primary-border);
    color: var(--button-primary-text);
}

.btn-primary:hover {
    background-color: var(--button-primary-hover-bg);
    border-color: var(--button-primary-hover-border);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.btn-secondary {
    background-color: var(--button-secondary-bg);
    border-color: var(--button-secondary-border);
    color: var(--button-secondary-text);
}

.btn-secondary:hover {
    background-color: var(--button-secondary-hover-bg);
    border-color: var(--button-secondary-hover-border);
    transform: translateY(-2px);
}

/* ---------- Option Card Hover & Floating Animation ---------- */
.option-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.option-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

/* ---------- Tables ---------- */
table {
    background-color: var(--table-bg);
    border-collapse: collapse;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 25px var(--shadow-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease;
}

table:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px var(--shadow-color);
}

th, td {
    padding: 18px;
    text-align: left;
    color: var(--text-color);
    transition: color 0.3s ease;
}

th {
    background-color: var(--table-header-bg);
    color: var(--table-header-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

tr:hover {
    background-color: var(--table-row-hover-bg);
    transition: background-color 0.3s ease;
}

/* ---------- Footer ---------- */
footer {
    text-align: center;
    padding: 20px 0;
    color: var(--navbar-text-color);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}