:root {
    --primary: #0D6E6E;
    --primary-dark: #0A5555;
    --primary-light: #14A3A3;
    --primary-soft: rgba(13, 110, 110, 0.08);
    --accent: #C4A35A;
    --accent-soft: rgba(196, 163, 90, 0.12);
    --secondary: #059669;
    --danger: #DC2626;
    --warning: #D97706;
    --success: #059669;
    --info: #0284C7;

    --bg-primary: #FFFFFF;
    --bg-secondary: #F4F7F9;
    --bg-tertiary: #E8EEF2;
    --bg-elevated: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --border-soft: rgba(226, 232, 240, 0.6);
    --shadow-color: rgba(15, 23, 42, 0.06);
    --shadow-sm: 0 1px 3px var(--shadow-color);
    --shadow: 0 4px 20px var(--shadow-color);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);

    --gradient-primary: linear-gradient(135deg, #0D6E6E 0%, #0A4F5C 50%, #083344 100%);
    --gradient-accent: linear-gradient(135deg, #C4A35A 0%, #A68B3D 100%);
    --gradient-1: linear-gradient(135deg, #0D6E6E 0%, #14A3A3 100%);
    --gradient-2: linear-gradient(135deg, #DC2626 0%, #F87171 100%);
    --gradient-3: linear-gradient(135deg, #0284C7 0%, #38BDF8 100%);
    --gradient-4: linear-gradient(135deg, #059669 0%, #34D399 100%);

    --sidebar-width: 272px;
    --header-height: 68px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #1E293B;
    --bg-secondary: #0F172A;
    --bg-tertiary: #334155;
    --bg-elevated: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-light: #64748B;
    --border: #334155;
    --border-soft: rgba(51, 65, 85, 0.6);
    --primary-soft: rgba(20, 163, 163, 0.12);
    --accent-soft: rgba(196, 163, 90, 0.15);
    --shadow-color: rgba(0, 0, 0, 0.25);
    --shadow-sm: 0 1px 3px var(--shadow-color);
    --shadow: 0 4px 20px var(--shadow-color);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.35);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.login-mode .sidebar,
body.login-mode .mobile-menu-toggle,
body.login-mode .mobile-overlay {
    display: none !important;
}

body.login-mode .main-container {
    margin-top: 0;
}

body.login-mode .main-content {
    margin-left: 0;
    padding: 0;
    min-height: 100vh;
}

body.login-mode .header {
    background: transparent;
    border-bottom: none;
    box-shadow: none;
    position: absolute;
}

body.login-mode .header-content {
    justify-content: flex-end;
}

body.login-mode .logo {
    display: none;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-soft);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.9);
}

.header-content {
    max-width: 100%;
    height: 100%;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo i {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(13, 110, 110, 0.25);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 12px 6px 16px;
    background: var(--bg-secondary);
    border-radius: 50px;
    border: 1px solid var(--border-soft);
}

.user-name {
    font-weight: 500;
    font-size: 14px;
    color: var(--text-primary);
}

.profile-btn {
    background: none;
    border: none;
    font-size: 26px;
    color: var(--primary);
    cursor: pointer;
    transition: transform var(--transition), color var(--transition);
    line-height: 1;
}

.profile-btn:hover {
    transform: scale(1.08);
    color: var(--primary-light);
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(13, 110, 110, 0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(13, 110, 110, 0.35);
}

.btn-outline-secondary {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

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

.btn-sm {
    padding: 8px 14px;
    font-size: 13px;
}

#theme-toggle {
    width: 42px;
    height: 42px;
    padding: 0;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Sidebar */
.main-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-primary);
    border-right: 1px solid var(--border-soft);
    position: fixed;
    left: 0;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--transition);
    z-index: 999;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.sidebar::-webkit-scrollbar {
    width: 5px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.sidebar-nav ul {
    list-style: none;
    padding: 16px 12px 24px;
}

.sidebar-nav li {
    margin: 2px 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    position: relative;
}

.sidebar-nav a i:first-child {
    width: 20px;
    text-align: center;
    font-size: 15px;
    opacity: 0.85;
}

.sidebar-nav a:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

.sidebar-nav .link.active a {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

.sidebar-nav .link.active a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--gradient-primary);
    border-radius: 0 3px 3px 0;
}

.sidebar-nav .logout {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-soft);
}

.sidebar-nav .logout a {
    color: var(--danger);
}

.sidebar-nav .logout a:hover {
    background: rgba(220, 38, 38, 0.08);
    color: var(--danger);
}

.sidebar-nav .badge {
    margin-left: auto;
    padding: 2px 8px;
    font-size: 10px;
    border-radius: 20px;
    min-width: 20px;
    text-align: center;
    font-weight: 700;
}

/* Submenu */
.sidebar-nav .menu-item.has-submenu > .submenu-toggle {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    cursor: pointer;
}

.sidebar-nav .submenu-arrow {
    font-size: 10px;
    transition: transform var(--transition);
    margin-left: auto;
    opacity: 0.5;
}

.sidebar-nav .menu-item.active .submenu-arrow {
    transform: rotate(180deg);
    opacity: 1;
}

.sidebar-nav .submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding var(--transition);
    margin: 0;
    padding: 0;
}

.sidebar-nav .menu-item.active .submenu {
    max-height: 500px;
    padding: 4px 0 4px 8px;
}

.sidebar-nav .submenu a {
    padding: 10px 16px 10px 44px;
    font-size: 13px;
    font-weight: 450;
}

.sidebar-nav .submenu .link.active a {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

.sidebar-nav .submenu a i {
    font-size: 12px;
    width: 16px;
    opacity: 0.75;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 28px 32px 40px;
    min-height: calc(100vh - var(--header-height));
    animation: fadeInContent 0.4s ease;
}

@keyframes fadeInContent {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 10px;
    transition: background var(--transition);
}

.mobile-menu-toggle:hover {
    background: var(--bg-tertiary);
}

.hamburger-line {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--transition);
}

.mobile-overlay.active {
    display: block;
    opacity: 1;
}

/* Cards */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-soft);
    margin-bottom: 20px;
    transition: box-shadow var(--transition), transform var(--transition);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-soft);
}

.card-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header h3 i {
    color: var(--primary);
    font-size: 15px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
    letter-spacing: 0.01em;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition);
}

.form-control:hover {
    border-color: var(--text-light);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-soft);
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

/* Notifications */
.notification {
    position: fixed;
    top: calc(var(--header-height) + 16px);
    right: 20px;
    background: var(--bg-primary);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-soft);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    max-width: 420px;
    transform: translateX(120%);
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10000;
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification-success {
    border-left: 4px solid var(--success);
}

.notification-error {
    border-left: 4px solid var(--danger);
}

.notification-info {
    border-left: 4px solid var(--info);
}

.notification button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    margin-left: auto;
    padding: 4px;
    border-radius: 4px;
    transition: color var(--transition);
}

.notification button:hover {
    color: var(--text-primary);
}

/* Loading */
.loading-spinner {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.loading-spinner i {
    font-size: 28px;
    margin-bottom: 16px;
    color: var(--primary);
}

.error-message {
    text-align: center;
    padding: 60px 20px;
    color: var(--danger);
}

/* Grid */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 20px 16px 32px;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }

    .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .logo span {
        display: none;
    }

    .user-name {
        display: none;
    }

    .header-content {
        padding: 0 16px;
    }
}