/* =============================================================================
   Theme CSS - Color Palette & Dark/Light Mode
   =============================================================================

   This file defines CSS custom properties (variables) for theming.
   All colors should reference these variables for consistency.

   Primary brand color: #667eea (purple-blue)
   Secondary brand color: #764ba2 (purple)
============================================================================= */

/* Light Theme (default) */
:root,
[data-theme="light"] {
    /* Brand Colors */
    --color-primary: #667eea;
    --color-primary-hover: #5a6fd6;
    --color-primary-light: rgba(102, 126, 234, 0.1);
    --color-secondary: #764ba2;
    --color-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Text Colors */
    --color-text-primary: #2c3e50;
    --color-text-secondary: #6c757d;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;

    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #e9ecef;
    --color-bg-hover: #f3f4f6;

    /* Border Colors */
    --color-border: #dee2e6;
    --color-border-light: #e9ecef;

    /* Navbar */
    --navbar-bg: var(--color-gradient);
    --navbar-text: #ffffff;
    --navbar-text-hover: rgba(255, 255, 255, 0.85);

    /* Cards & Surfaces */
    --card-bg: #ffffff;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);

    /* Footer */
    --footer-bg: #1a1a2e;
    --footer-text: rgba(255, 255, 255, 0.8);
    --footer-heading: #ffffff;

    /* Alerts */
    --alert-info-bg: #e7f3ff;
    --alert-info-border: #b6d4fe;
    --alert-info-text: #084298;

    /* Forms */
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-focus-border: var(--color-primary);

    /* Code */
    --code-bg: #f8f9fa;
    --code-text: #e83e8c;

    /* Scrollbar */
    --scrollbar-track: #f1f1f1;
    --scrollbar-thumb: #c1c1c1;
    --scrollbar-thumb-hover: #a1a1a1;
}

/* Dark Theme */
[data-theme="dark"] {
    /* Brand Colors - slightly adjusted for dark mode */
    --color-primary: #7c93ed;
    --color-primary-hover: #8fa3f0;
    --color-primary-light: rgba(124, 147, 237, 0.15);
    --color-secondary: #9b6bc3;
    --color-gradient: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);

    /* Text Colors */
    --color-text-primary: #e2e8f0;
    --color-text-secondary: #a0aec0;
    --color-text-muted: #718096;
    --color-text-inverse: #1a202c;

    /* Background Colors */
    --color-bg-primary: #1a202c;
    --color-bg-secondary: #2d3748;
    --color-bg-tertiary: #4a5568;
    --color-bg-hover: #3d4a5c;

    /* Border Colors */
    --color-border: #4a5568;
    --color-border-light: #3d4452;

    /* Navbar */
    --navbar-bg: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    --navbar-text: #e2e8f0;
    --navbar-text-hover: #ffffff;

    /* Cards & Surfaces */
    --card-bg: #2d3748;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.4);

    /* Footer */
    --footer-bg: #0d1117;
    --footer-text: rgba(255, 255, 255, 0.7);
    --footer-heading: #e2e8f0;

    /* Alerts */
    --alert-info-bg: #1e3a5f;
    --alert-info-border: #2d5a8a;
    --alert-info-text: #93c5fd;

    /* Forms */
    --input-bg: #2d3748;
    --input-border: #4a5568;
    --input-focus-border: var(--color-primary);

    /* Code */
    --code-bg: #2d3748;
    --code-text: #f687b3;

    /* Scrollbar */
    --scrollbar-track: #2d3748;
    --scrollbar-thumb: #4a5568;
    --scrollbar-thumb-hover: #5a6a7e;
}

/* =============================================================================
   Global Styles Using Theme Variables
============================================================================= */

body {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Links */
a {
    color: var(--color-primary);
}

a:hover {
    color: var(--color-primary-hover);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* =============================================================================
   Navbar Styles
============================================================================= */

.navbar {
    background: var(--navbar-bg);
    padding: 0.75rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease;
}

.navbar-brand {
    color: var(--navbar-text) !important;
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.4rem;
}

.navbar-brand:hover {
    color: var(--navbar-text-hover) !important;
}

.navbar .nav-link {
    color: var(--navbar-text) !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color 0.2s ease, background 0.2s ease;
    border-radius: 6px;
}

.navbar .nav-link:hover {
    color: var(--navbar-text-hover) !important;
    background: rgba(255, 255, 255, 0.1);
}

/* Dropdown Menus */
.navbar .dropdown-menu {
    background: var(--card-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    box-shadow: var(--card-shadow-hover);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.navbar .dropdown-item {
    color: var(--color-text-primary);
    padding: 0.6rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: background 0.2s ease;
}

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

.navbar .dropdown-item i {
    color: var(--color-primary);
    font-size: 1.1rem;
    width: 20px;
}

/* Register Button Style */
.btn-register {
    background: rgba(255, 255, 255, 0.15) !important;
    border-radius: 20px !important;
    padding: 0.4rem 1.25rem !important;
    margin-left: 0.5rem;
}

.btn-register:hover {
    background: rgba(255, 255, 255, 0.25) !important;
}

/* Theme Toggle Button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    margin-left: 0.75rem;
    color: var(--navbar-text);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.theme-toggle i {
    font-size: 1.1rem;
    transition: opacity 0.2s ease;
}

/* Show/hide sun/moon icons based on theme */
[data-theme="light"] #themeIconLight {
    display: none;
}
[data-theme="light"] #themeIconDark {
    display: block;
}
[data-theme="dark"] #themeIconLight {
    display: block;
}
[data-theme="dark"] #themeIconDark {
    display: none;
}

/* Mobile Navbar Toggle */
.navbar-toggler {
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* =============================================================================
   Main Content Area
============================================================================= */

.main-content {
    min-height: calc(100vh - 200px);
    padding-bottom: 2rem;
}

/* =============================================================================
   Footer Styles
============================================================================= */

.site-footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 3rem 0 1.5rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h5 {
    color: var(--footer-heading);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand h5 i {
    color: var(--color-primary);
}

.footer-brand p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
    max-width: 300px;
}

.footer-links h6 {
    color: var(--footer-heading);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.6rem;
}

.footer-links a {
    color: var(--footer-text);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--footer-text);
}

/* Responsive Footer */
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .footer-brand p {
        max-width: none;
    }
}

/* =============================================================================
   Alert Styles
============================================================================= */

.alert-info {
    background-color: var(--alert-info-bg);
    border-color: var(--alert-info-border);
    color: var(--alert-info-text);
}

/* =============================================================================
   Card Styles
============================================================================= */

.card {
    background: var(--card-bg);
    border: 1px solid var(--color-border);
    box-shadow: var(--card-shadow);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
    box-shadow: var(--card-shadow-hover);
}

/* =============================================================================
   Form Styles
============================================================================= */

.form-control {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--color-text-primary);
}

.form-control:focus {
    background-color: var(--input-bg);
    border-color: var(--input-focus-border);
    color: var(--color-text-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

/* =============================================================================
   Button Styles
============================================================================= */

.btn-primary {
    background: var(--color-gradient);
    border: none;
    color: white;
    font-weight: 500;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-secondary) 100%);
    color: white;
}

.btn-outline-primary {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline-primary:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}