/* iOS 14 System UI Theme - Dark Mode */
:root {
    --ios-bg: #000000;
    --ios-surface: #1c1c1e;
    --ios-surface-elevated: #2c2c2e;
    --ios-card: rgba(44, 44, 46, 0.85);
    --ios-border: rgba(120, 120, 128, 0.24);
    --ios-text: #ffffff;
    --ios-text-secondary: rgba(255, 255, 255, 0.6);
    --ios-text-tertiary: rgba(255, 255, 255, 0.3);
    --ios-blue: #0a84ff;
    --ios-blue-hover: #409cff;
    --ios-green: #30d158;
    --ios-red: #ff453a;
    --ios-orange: #ff9f0a;
    --ios-yellow: #ffd60a;
    --ios-teal: #64d2ff;
    --ios-purple: #bf5af2;
    --ios-pink: #ff375f;
    --ios-gray: #8e8e93;
    --ios-glass: rgba(28, 28, 30, 0.72);
    --ios-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --ios-radius-sm: 8px;
    --ios-radius-md: 12px;
    --ios-radius-lg: 20px;
    --ios-radius-xl: 28px;
    --ios-transition: cubic-bezier(0.32, 0.72, 0, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
    background: var(--ios-bg);
    color: var(--ios-text);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ========== iOS Animations ========== */
@keyframes iosFadeIn {
    from { opacity: 0; transform: scale(0.96); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes iosSlideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes iosSlideInRight {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes iosPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes iosShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

@keyframes iosSpinner {
    to { transform: rotate(360deg); }
}

.ios-fade { animation: iosFadeIn 0.4s var(--ios-transition) forwards; }
.ios-slide-up { animation: iosSlideUp 0.5s var(--ios-transition) forwards; }
.ios-slide-right { animation: iosSlideInRight 0.4s var(--ios-transition) forwards; }
.ios-shake { animation: iosShake 0.4s ease-in-out; }

/* ========== iOS Glass / Card ========== */
.ios-card {
    background: var(--ios-card);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--ios-border);
    border-radius: var(--ios-radius-lg);
    box-shadow: var(--ios-shadow);
    transition: transform 0.3s var(--ios-transition), box-shadow 0.3s ease;
}

.ios-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.ios-section {
    background: var(--ios-surface);
    border-radius: var(--ios-radius-lg);
    overflow: hidden;
    margin-bottom: 16px;
}

.ios-section-header {
    padding: 16px 20px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ios-text);
    border-bottom: 1px solid var(--ios-border);
}

/* ========== iOS Buttons ========== */
.ios-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: var(--ios-radius-md);
    cursor: pointer;
    transition: all 0.25s var(--ios-transition);
    position: relative;
    overflow: hidden;
    outline: none;
    letter-spacing: 0.01em;
}

.ios-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: background 0.2s;
}

.ios-btn:active { transform: scale(0.96); }
.ios-btn:active::after { background: rgba(255,255,255,0.15); }

.ios-btn-blue {
    background: var(--ios-blue);
    color: #fff;
}
.ios-btn-blue:hover { background: var(--ios-blue-hover); }

.ios-btn-green {
    background: var(--ios-green);
    color: #000;
}

.ios-btn-red {
    background: var(--ios-red);
    color: #fff;
}

.ios-btn-orange {
    background: var(--ios-orange);
    color: #000;
}

.ios-btn-gray {
    background: var(--ios-surface-elevated);
    color: var(--ios-blue);
    border: 1px solid var(--ios-border);
}

.ios-btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: var(--ios-radius-sm);
}

/* ========== iOS Form Inputs ========== */
.ios-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    font-family: inherit;
    color: var(--ios-text);
    background: var(--ios-surface-elevated);
    border: 1px solid var(--ios-border);
    border-radius: var(--ios-radius-md);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.ios-input:focus {
    border-color: var(--ios-blue);
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.ios-input::placeholder {
    color: var(--ios-text-tertiary);
}

/* ========== iOS Table ========== */
.ios-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.ios-table th {
    padding: 14px 16px;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
    color: var(--ios-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--ios-border);
}

.ios-table td {
    padding: 14px 16px;
    font-size: 14px;
    color: var(--ios-text);
    border-bottom: 1px solid var(--ios-border);
    transition: background 0.2s;
}

.ios-table tr:hover td {
    background: rgba(255, 255, 255, 0.03);
}

.ios-table tr:last-child td {
    border-bottom: none;
}

/* ========== iOS Modal ========== */
.ios-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.ios-modal.active {
    display: flex;
    opacity: 1;
}

.ios-modal-content {
    background: var(--ios-surface);
    border-radius: var(--ios-radius-xl);
    width: 90%;
    max-width: 420px;
    max-height: 85vh;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.35s var(--ios-transition);
}

.ios-modal.active .ios-modal-content {
    transform: scale(1) translateY(0);
}

.ios-modal-header {
    padding: 20px 24px 12px;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
}

.ios-modal-body {
    padding: 0 24px 20px;
}

.ios-modal-footer {
    display: flex;
    border-top: 1px solid var(--ios-border);
}

.ios-modal-footer button {
    flex: 1;
    padding: 16px;
    background: none;
    border: none;
    color: var(--ios-blue);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.ios-modal-footer button:hover {
    background: rgba(255, 255, 255, 0.05);
}

.ios-modal-footer button + button {
    border-left: 1px solid var(--ios-border);
}

.ios-modal-footer button.ios-danger-btn {
    color: var(--ios-red);
}

/* ========== iOS Navigation / Sidebar ========== */
.ios-sidebar {
    width: 260px;
    background: var(--ios-surface);
    border-right: 1px solid var(--ios-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transition: transform 0.35s var(--ios-transition);
}

.ios-sidebar-header {
    padding: 28px 24px 20px;
    border-bottom: 1px solid var(--ios-border);
}

.ios-sidebar-header h2 {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.ios-sidebar-header p {
    font-size: 13px;
    color: var(--ios-text-secondary);
    margin-top: 4px;
}

.ios-nav {
    flex: 1;
    padding: 12px;
    overflow-y: auto;
}

.ios-nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: var(--ios-radius-md);
    color: var(--ios-text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.25s var(--ios-transition);
    margin-bottom: 4px;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.ios-nav-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--ios-text);
}

.ios-nav-item.active {
    background: var(--ios-blue);
    color: #fff;
    font-weight: 600;
}

.ios-nav-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.ios-sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--ios-border);
    font-size: 13px;
    color: var(--ios-text-tertiary);
    text-align: center;
}

/* ========== iOS Top Bar ========== */
.ios-topbar {
    height: 64px;
    background: var(--ios-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--ios-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.ios-topbar-title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.ios-topbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--ios-text-secondary);
}

/* ========== iOS Login Screen ========== */
.ios-login-bg {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: 
        radial-gradient(circle at 20% 50%, rgba(10, 132, 255, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(191, 90, 242, 0.08) 0%, transparent 40%),
        var(--ios-bg);
    padding: 20px;
}

.ios-login-card {
    width: 100%;
    max-width: 400px;
    background: var(--ios-card);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid var(--ios-border);
    border-radius: var(--ios-radius-xl);
    padding: 40px 32px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
    animation: iosFadeIn 0.6s var(--ios-transition) forwards;
}

.ios-login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.ios-login-logo .icon-wrap {
    width: 72px;
    height: 72px;
    background: var(--ios-blue);
    border-radius: var(--ios-radius-lg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: 16px;
    box-shadow: 0 8px 24px rgba(10, 132, 255, 0.35);
}

.ios-login-logo h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.ios-login-logo p {
    font-size: 14px;
    color: var(--ios-text-secondary);
    margin-top: 6px;
}

.ios-form-group {
    margin-bottom: 20px;
}

.ios-form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--ios-text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ios-login-error {
    background: rgba(255, 69, 58, 0.12);
    color: var(--ios-red);
    padding: 12px 16px;
    border-radius: var(--ios-radius-md);
    font-size: 14px;
    margin-bottom: 20px;
    text-align: center;
    animation: iosShake 0.4s ease-in-out;
}

/* ========== iOS Status Badge ========== */
.ios-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.ios-badge-green {
    background: rgba(48, 209, 88, 0.15);
    color: var(--ios-green);
}

.ios-badge-red {
    background: rgba(255, 69, 58, 0.15);
    color: var(--ios-red);
}

.ios-badge-blue {
    background: rgba(10, 132, 255, 0.15);
    color: var(--ios-blue);
}

.ios-badge-orange {
    background: rgba(255, 159, 10, 0.15);
    color: var(--ios-orange);
}

/* ========== iOS Toast ========== */
.ios-toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--ios-surface-elevated);
    color: var(--ios-text);
    padding: 12px 24px;
    border-radius: var(--ios-radius-xl);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--ios-shadow);
    border: 1px solid var(--ios-border);
    opacity: 0;
    transition: all 0.35s var(--ios-transition);
    z-index: 2000;
    pointer-events: none;
}

.ios-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ========== iOS Switch ========== */
.ios-switch {
    position: relative;
    width: 52px;
    height: 32px;
    background: var(--ios-surface-elevated);
    border-radius: 16px;
    cursor: pointer;
    transition: background 0.3s;
    border: 1px solid var(--ios-border);
    appearance: none;
    -webkit-appearance: none;
}

.ios-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 26px;
    height: 26px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
    transition: transform 0.3s var(--ios-transition);
}

.ios-switch:checked {
    background: var(--ios-green);
    border-color: var(--ios-green);
}

.ios-switch:checked::after {
    transform: translateX(20px);
}

/* ========== iOS Tabs ========== */
.ios-tabs {
    display: flex;
    gap: 8px;
    padding: 4px;
    background: var(--ios-surface-elevated);
    border-radius: var(--ios-radius-md);
    margin-bottom: 20px;
    width: fit-content;
}

.ios-tab {
    padding: 8px 16px;
    border-radius: var(--ios-radius-sm);
    font-size: 14px;
    font-weight: 600;
    color: var(--ios-text-secondary);
    cursor: pointer;
    border: none;
    background: none;
    transition: all 0.25s var(--ios-transition);
}

.ios-tab.active {
    background: var(--ios-blue);
    color: #fff;
}

/* ========== iOS Data List / Collection ========== */
.ios-data-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    border-bottom: 1px solid var(--ios-border);
    transition: background 0.2s;
    cursor: pointer;
}

.ios-data-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.ios-data-item:last-child {
    border-bottom: none;
}

.ios-data-content {
    flex: 1;
    min-width: 0;
}

.ios-data-title {
    font-size: 15px;
    font-weight: 500;
    word-break: break-all;
    line-height: 1.5;
}

.ios-data-meta {
    font-size: 12px;
    color: var(--ios-text-secondary);
    margin-top: 6px;
    display: flex;
    gap: 12px;
}

/* ========== iOS Resource Card ========== */
.ios-resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.ios-resource-card {
    background: var(--ios-card);
    border: 1px solid var(--ios-border);
    border-radius: var(--ios-radius-lg);
    padding: 20px;
    transition: all 0.3s var(--ios-transition);
}

.ios-resource-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    border-color: rgba(10, 132, 255, 0.3);
}

.ios-resource-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}

.ios-resource-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--ios-radius-md);
    object-fit: cover;
    background: var(--ios-surface-elevated);
}

.ios-resource-title {
    font-size: 16px;
    font-weight: 700;
}

.ios-resource-desc {
    font-size: 13px;
    color: var(--ios-text-secondary);
    line-height: 1.4;
    margin-bottom: 16px;
}

/* ========== iOS Pagination ========== */
.ios-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
}

.ios-page-btn {
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--ios-radius-sm);
    background: var(--ios-surface-elevated);
    color: var(--ios-text);
    border: 1px solid var(--ios-border);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.ios-page-btn:hover {
    background: rgba(10, 132, 255, 0.15);
    border-color: var(--ios-blue);
}

.ios-page-btn.active {
    background: var(--ios-blue);
    color: #fff;
    border-color: var(--ios-blue);
}

/* ========== Layout ========== */
.ios-layout {
    display: flex;
    min-height: 100vh;
}

.ios-main {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.ios-content {
    flex: 1;
    padding: 28px;
    max-width: 1400px;
}

/* ========== iOS Checkbox ========== */
.ios-checkbox {
    width: 22px;
    height: 22px;
    border-radius: 6px;
    border: 2px solid var(--ios-gray);
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
    flex-shrink: 0;
    margin-top: 2px;
}

.ios-checkbox:checked {
    background: var(--ios-blue);
    border-color: var(--ios-blue);
}

.ios-checkbox:checked::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 1px;
    width: 6px;
    height: 11px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* ========== Mobile ========== */
@media (max-width: 768px) {
    .ios-sidebar {
        transform: translateX(-100%);
    }
    .ios-sidebar.open {
        transform: translateX(0);
    }
    .ios-main {
        margin-left: 0;
    }
    .ios-content {
        padding: 16px;
    }
    .ios-resource-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.25);
}