/* ===== CSS Variables ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    
    --border: #e2e8f0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    
    --max-width: 1200px;
}

[data-theme="dark"] {
    --bg-primary: #1e293b;
    --bg-secondary: #0f172a;
    --bg-tertiary: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    
    --border: #334155;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.47059;
    letter-spacing: -0.022em;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 400;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    margin: 0;
    padding: 0;
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

.screen {
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ===== Splash Screen ===== */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.3s ease-out;
}

[data-theme="dark"] .splash-screen {
    background: rgba(15, 23, 42, 0.8);
}

.splash-content {
    text-align: center;
    color: var(--text-primary);
}

.logo-container {
    margin-bottom: 24px;
}

.logo-circle {
    width: 120px;
    height: 120px;
    background: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
    border: 2px solid var(--border);
    animation: pulse 2s ease-in-out infinite;
}

.splash-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.splash-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.loader {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 1s linear infinite;
}

[data-theme="dark"] .loader {
    border-color: #334155;
    border-top-color: var(--primary);
}

/* Modern Loader */
.modern-loader {
    position: relative;
    width: 60px;
    height: 60px;
    margin: 0 auto;
}

.loader-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1.5s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

.loader-ring:nth-child(2) {
    width: 75%;
    height: 75%;
    top: 12.5%;
    left: 12.5%;
    border-top-color: var(--primary-light);
    animation-duration: 1.2s;
    animation-direction: reverse;
}

.loader-ring:nth-child(3) {
    width: 50%;
    height: 50%;
    top: 25%;
    left: 25%;
    border-top-color: var(--primary-dark);
    animation-duration: 0.9s;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== Setup Screen ===== */
.setup-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 24px;
}

.setup-header {
    text-align: center;
    margin-bottom: 32px;
    padding-top: 48px;
}

.logo-small {
    margin: 0 auto 16px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.setup-header h2 {
    font-size: 1.875rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.setup-header p {
    color: var(--text-secondary);
}

.setup-form {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.form-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 4px;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea,
[data-theme="dark"] .form-group select {
    background: var(--bg-tertiary);
    color: #f1f5f9;
    border-color: var(--border);
}

[data-theme="dark"] .form-group input::placeholder,
[data-theme="dark"] .form-group textarea::placeholder {
    color: #94a3b8;
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus,
[data-theme="dark"] .form-group select:focus {
    background: var(--bg-primary);
    color: #ffffff;
}

.form-actions {
    margin-top: 32px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    text-decoration: none;
    color: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
}

[data-theme="dark"] .btn-outline {
    color: #f1f5f9;
    border-color: var(--border);
}

[data-theme="dark"] .btn-outline:hover {
    color: var(--primary);
    border-color: var(--primary);
}

.btn-manual {
    min-width: 200px;
    font-size: 1rem;
}

.btn-manual svg {
    transition: var(--transition);
}

.btn-manual:hover svg {
    transform: rotate(-5deg) scale(1.1);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ===== Top Navigation ===== */
.top-nav {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 10px 16px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-toggle {
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    width: 56px;
    height: 28px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 14px 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    z-index: 99;
}

.nav-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.nav-toggle svg {
    transition: transform 0.3s ease-out;
}

.top-nav.hidden + .tab-nav .nav-toggle svg {
    transform: rotate(180deg);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    gap: 16px;
}

.nav-left {
    display: flex;
    align-items: center;
}

.nav-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    justify-content: center;
}

.compact-stats {
    display: flex;
    gap: 12px;
    align-items: center;
}

.compact-stat {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 20px;
    color: var(--success);
    font-weight: 700;
    font-size: 1rem;
}

.compact-stat.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.compact-stat svg {
    flex-shrink: 0;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-indicator {
    display: flex;
    align-items: center;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 50%;
    border: 2px solid var(--border);
    transition: var(--transition);
}

.status-indicator:hover {
    border-color: var(--success);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s ease-in-out infinite;
}

.status-indicator.offline .status-dot {
    background: var(--error);
}

.status-indicator.offline:hover {
    border-color: var(--error);
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
    transform: translateY(-1px);
}

.icon-btn:active {
    transform: translateY(0);
}

/* ===== Tab Navigation ===== */
.tab-nav {
    display: flex;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 0 16px;
    gap: 4px;
    overflow-x: auto;
    position: sticky;
    top: 52px;
    z-index: 99;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s ease-out;
}

.tab-nav.hidden {
    transform: translateY(-100%);
}

.nav-toggle {
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    width: 56px;
    height: 28px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 14px 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    z-index: 98;
}

.nav-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.nav-toggle svg {
    transition: transform 0.3s ease-out;
}

.tab-nav.hidden .nav-toggle svg {
    transform: rotate(180deg);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    white-space: nowrap;
    position: relative;
}

.tab-btn svg {
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.05);
}

.tab-btn:hover svg {
    transform: scale(1.1);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

.tab-btn.active svg {
    filter: drop-shadow(0 2px 4px rgba(99, 102, 241, 0.3));
}

/* ===== Tab Content ===== */
.tab-content {
    display: none;
    flex: 1;
    padding: 0;
    width: 100%;
    max-width: 100%;
    margin: 0;
    box-sizing: border-box;
    overflow: hidden;
    height: calc(100vh - 130px);
    height: calc(100dvh - 130px);
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

/* Container wrapper for consistent max-width */
.scan-container,
.lookup-container {
    max-width: 100%;
    margin: 0;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.history-container {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 12px;
    box-sizing: border-box;
}

/* ===== Scan Container ===== */
.scan-container,
.lookup-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    overflow: hidden;
}

.scan-area-fullscreen,
.lookup-area-fullscreen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(139, 92, 246, 0.03) 100%);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
    margin: 12px;
}

.scan-area-fullscreen::before,
.lookup-area-fullscreen::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.05) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

.scan-area-fullscreen:hover,
.lookup-area-fullscreen:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
}

.scan-prompt,
.lookup-prompt {
    text-align: center;
    position: relative;
    z-index: 1;
    transition: var(--transition);
    padding: 20px;
}

.scan-area-fullscreen:hover .scan-prompt,
.lookup-area-fullscreen:hover .lookup-prompt {
    transform: scale(1.02);
}

.nfc-icon,
.search-icon {
    margin-bottom: 16px;
    animation: float 3s ease-in-out infinite;
}

.scan-prompt h3,
.lookup-prompt h3 {
    font-size: clamp(1.5rem, 5vw, 2rem);
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 700;
}

.scan-prompt p,
.lookup-prompt p {
    color: var(--text-secondary);
    font-size: clamp(0.875rem, 3vw, 1.125rem);
}

/* ===== Student Display Fullscreen ===== */
.student-display-fullscreen,
.lookup-results-fullscreen {
    width: 100%;
    height: 100%;
    animation: slideIn 0.3s ease-out;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    overflow-y: auto;
    box-sizing: border-box;
}

.student-card-fullscreen {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: clamp(16px, 4vw, 32px);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 100%;
    max-height: 100%;
    overflow-y: auto;
    box-sizing: border-box;
}

.student-header-large {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    position: relative;
}

.student-photo-large {
    width: clamp(120px, 30vw, 180px);
    height: clamp(120px, 30vw, 180px);
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary);
    background: var(--bg-tertiary);
    box-shadow: var(--shadow-lg);
    flex-shrink: 0;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.student-photo-large:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.student-photo-large::after {
    content: '🔍';
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    opacity: 0;
    transition: var(--transition);
}

.student-photo-large:hover::after {
    opacity: 1;
}

.student-photo-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.student-info-large {
    text-align: center;
    margin-bottom: 16px;
}

.student-info-large h2 {
    font-size: clamp(1.25rem, 5vw, 2rem);
    margin: 0 0 6px 0;
    font-weight: 700;
    color: var(--text-primary);
}

.student-info-large p {
    font-size: clamp(0.875rem, 3vw, 1.125rem);
    color: var(--text-secondary);
    margin: 4px 0;
}

.student-id-badge-large {
    display: inline-block;
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    font-size: clamp(0.75rem, 2.5vw, 1rem);
    font-weight: 700;
    color: var(--primary);
    margin-top: 6px;
}

.info-grid-large {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media (min-width: 480px) {
    .info-grid-large {
        grid-template-columns: 1fr 1fr;
    }
}

.info-card-large {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 12px;
}

.info-card-large h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin: 0 0 10px 0;
    font-weight: 600;
}

.fees-info-large,
.attendance-info-large {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.fee-item-large,
.attendance-item-large {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: clamp(0.875rem, 2.5vw, 1rem);
    padding: 6px 0;
}

.fee-item-large span,
.attendance-item-large span {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: clamp(0.8125rem, 2.5vw, 0.9375rem);
}

.fee-item-large strong,
.attendance-item-large strong {
    font-weight: 700;
    color: var(--text-primary);
    font-size: clamp(1rem, 3vw, 1.25rem);
}

/* ===== Lookup Container ===== */
.lookup-container {
    overflow-y: auto;
}

.lookup-results {
    flex: 1;
    overflow-y: auto;
}

/* ===== History Container ===== */
.history-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-right: 4px;
}

.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 16px;
    margin-top: auto;
    flex-shrink: 0;
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}

.page-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 120px;
    text-align: center;
}

.pagination .btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.scan-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    transform: scaleY(0);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.stat-card:hover::before {
    transform: scaleY(1);
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
}

.stat-icon::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 14px;
    padding: 2px;
    background: linear-gradient(135deg, currentColor, transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.2;
}

.stat-icon.success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(16, 185, 129, 0.05));
    color: var(--success);
}

.stat-icon.pending {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.05));
    color: var(--warning);
}

.stat-info {
    flex: 1;
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-value {
    display: block;
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ===== Scan Area ===== */
.scan-area {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.scan-area::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.03) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

.scan-area:hover {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
}

.scan-prompt {
    text-align: center;
    position: relative;
    z-index: 1;
}

.nfc-icon {
    margin-bottom: 16px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.scan-prompt h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 700;
}

.scan-prompt p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ===== Student Display ===== */
.student-display {
    width: 100%;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.student-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-lg);
    padding: 32px;
    color: white;
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.student-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.student-photo {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid rgba(255, 255, 255, 0.3);
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 1;
}

.student-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.student-info {
    flex: 1;
    position: relative;
    z-index: 1;
}

.student-info h3 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.student-info p {
    opacity: 0.9;
    margin: 2px 0;
}

.attendance-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 24px;
    backdrop-filter: blur(10px);
    font-weight: 600;
    position: relative;
    z-index: 1;
}

/* ===== Info Grid ===== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}

.info-card {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
}

.info-card h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.fees-info,
.attendance-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fee-item,
.attendance-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

.fee-item span,
.attendance-item span {
    color: var(--text-secondary);
}

.fee-item strong,
.attendance-item strong {
    font-size: 1.125rem;
    color: var(--text-primary);
}

/* ===== Manual Entry ===== */
.manual-entry {
    text-align: center;
}

/* ===== Lookup Container ===== */
.lookup-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-header {
    text-align: center;
    margin-bottom: 32px;
}

.search-header h2 {
    font-size: 1.875rem;
    margin-bottom: 8px;
}

.search-header p {
    color: var(--text-secondary);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.search-box svg {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-box input {
    flex: 1;
    border: none;
    font-size: 1rem;
    background: transparent;
    color: var(--text-primary);
}

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

.search-box input:focus {
    outline: none;
    color: var(--text-primary);
}

[data-theme="dark"] .search-box input {
    color: #f1f5f9;
}

[data-theme="dark"] .search-box input::placeholder {
    color: #94a3b8;
}

.search-btn {
    padding: 8px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    background: var(--primary-dark);
}

.lookup-results {
    animation: fadeIn 0.3s ease-out;
}

/* ===== History Container ===== */
.history-container {
    max-width: 900px;
    margin: 0 auto;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.history-header h2 {
    font-size: 1.5rem;
}

.history-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-select {
    padding: 8px 32px 8px 12px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%2364748b' d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.filter-select:hover {
    border-color: var(--primary);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

[data-theme="dark"] .filter-select {
    background: var(--bg-tertiary);
    color: #f1f5f9;
    border-color: var(--border);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%2394a3b8' d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
}

[data-theme="dark"] .filter-select option {
    background: var(--bg-secondary);
    color: #f1f5f9;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.history-info {
    flex: 1;
}

.history-info h4 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.history-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.history-status {
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.history-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.history-status.pending {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.history-status.failed {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-out;
    color: var(--text-primary);
}

[data-theme="dark"] .modal-content {
    background: var(--bg-secondary);
    color: #f1f5f9;
}

[data-theme="dark"] .modal-header h3 {
    color: #ffffff;
}

[data-theme="dark"] .modal-body label {
    color: #f1f5f9;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.25rem;
}

.close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    gap: 12px;
    padding: 24px;
    border-top: 1px solid var(--border);
}

.modal-footer .btn {
    flex: 1;
}

/* ===== Photo Zoom Modal ===== */
.photo-zoom-content {
    position: relative;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    max-width: 90vw;
    max-height: 90vh;
    animation: zoomIn 0.3s ease-out;
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.photo-zoom-content img {
    max-width: 100%;
    max-height: 80vh;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    object-fit: contain;
}

.photo-zoom-content p {
    margin-top: 16px;
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: 600;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.photo-zoom-close {
    position: absolute;
    top: -50px;
    right: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid white;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.photo-zoom-close:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

/* ===== Status Banner ===== */
.status-banner {
    position: sticky;
    top: 52px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 98;
    animation: slideDown 0.3s ease-out;
    box-shadow: var(--shadow-sm);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-100%);
    }
}

.status-banner-success {
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success);
    color: var(--success);
}

.status-banner-error {
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--error);
    color: var(--error);
}

.status-banner-warning {
    background: rgba(245, 158, 11, 0.1);
    border-left: 4px solid var(--warning);
    color: var(--warning);
}

.status-banner-info {
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--info);
    color: var(--info);
}

.status-banner-icon {
    flex-shrink: 0;
}

.status-banner-message {
    flex: 1;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

.status-banner-close {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.status-banner-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .top-nav {
        padding: 12px 16px;
    }
    
    .tab-nav {
        padding: 0 16px;
    }
    
    .tab-content {
        padding: 16px;
    }
    
    .scan-area {
        padding: 24px;
    }
    
    .student-card {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .history-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .history-actions {
        width: 100%;
    }
    
    .filter-select {
        flex: 1;
        min-width: 0;
    }
    
    .modal {
        padding: 16px;
    }
    
    .toast-container {
        bottom: 16px;
        right: 16px;
        left: 16px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .splash-content h1 {
        font-size: 2rem;
    }
    
    .logo-circle {
        width: 100px;
        height: 100px;
    }
    
    .setup-header {
        padding-top: 24px;
    }
    
    .setup-header h2 {
        font-size: 1.5rem;
    }
    
    .scan-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 16px;
    }
    
    .search-box {
        flex-wrap: wrap;
    }
    
    .search-btn {
        width: 100%;
    }
}

/* ===== Loading States ===== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 12px;
}

/* ===== Empty States ===== */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    opacity: 0.3;
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.875rem;
}

/* ===== Accessibility ===== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Print Styles ===== */
@media print {
    .top-nav,
    .tab-nav,
    .manual-entry,
    .modal,
    .toast-container {
        display: none !important;
    }
    
    .tab-content {
        display: block !important;
    }
}