:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --border-color: #dee2e6;
    --accent-color: #E63946;
    --accent-hover: #A8003A;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --sidebar-bg: #1a1d23;
    --sidebar-text: #cbd5e0;
    --sidebar-hover: #2d3748;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.07);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --modal-bg: #ffffff;
    --modal-text: #212529;
    --card-bg: #ffffff;
    --hover-bg: #f8f9fa;
}

[data-theme="dark"] {
    --bg-primary: #1a1d23;
    --bg-secondary: #2d3748;
    --bg-tertiary: #4a5568;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0; /* Zvýšený kontrast */
    --text-tertiary: #cbd5e0; /* Zvýšený kontrast */
    --border-color: #4a5568;
    --sidebar-bg: #0f1114;
    --sidebar-text: #f7fafc; /* Maximální kontrast - skoro bílá */
    --sidebar-hover: #1a1d23;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
    --modal-bg: #2d3748;
    --modal-text: #e2e8f0;
    --card-bg: #2d3748;
    --hover-bg: #4a5568;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#app {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

.sidebar.collapsed {
    width: 0;
    overflow: hidden;
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo {
    color: #E63946;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--sidebar-text);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background-color: var(--sidebar-hover);
    color: #E63946;
}

/* Navigation */
.nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.nav-item:hover {
    background-color: var(--sidebar-hover);
    color: #E63946;
}

.nav-item.active {
    background-color: var(--sidebar-hover);
    color: #E63946;
    border-left: 3px solid #E63946;
}

.nav-item .material-icons {
    margin-right: 0.75rem;
    font-size: 1.25rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-area {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.module-content {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

/* Login Form */
.login-form {
    margin-top: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: #E63946;
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #E63946 0%, #A8003A 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(230, 57, 70, 0.3);
}

.btn-block {
    width: 100%;
}

.btn-google-login {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: white;
    border: 1px solid #dadce0;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    color: #3c4043;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-google-login:hover {
    background: #f8f9fa;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.btn-google-login img {
    width: 20px;
    height: 20px;
}

.login-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.5rem 0;
    color: var(--text-secondary);
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.login-divider span {
    padding: 0 1rem;
    font-size: 0.875rem;
}

.login-error {
    margin-top: 1rem;
    padding: 0.75rem;
    background: #fee;
    border: 1px solid #fcc;
    border-radius: 6px;
    color: #c33;
    font-size: 0.875rem;
}

.login-note {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Menu Toggle Button */
.menu-toggle {
    position: fixed;
    top: 1rem;
    left: 1rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.5rem;
    cursor: pointer;
    z-index: 1000;
    display: none;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        z-index: 999;
    }

    .menu-toggle {
        display: block;
    }
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: auto;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 0.75rem;
}

.user-info {
    flex: 1;
}

.user-name {
    color: white;
    font-weight: 500;
    font-size: 0.875rem;
}

.user-email {
    color: var(--text-tertiary);
    font-size: 0.75rem;
}

.logout-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.logout-btn:hover {
    background-color: var(--sidebar-hover);
    color: #E63946;
}