/* Enhanced Global Styles */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}
:root {
    --background-color: #f7f7f7;
    --text-color: #1a1a1a;
    --subtle-text-color: #a0a0a0;
    --button-bg: #fff;
    --button-border: #e0e0e0;
    --button-hover-border: #1a1a1a;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    text-align: center;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px 120px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: calc(100vh - 200px);
    flex: 1;
}

.header-title {
    position: fixed;
    top: 60px;
    right: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--subtle-text-color);
    letter-spacing: 2px;
    text-transform: uppercase;
    z-index: 10;
}

#initial-view, #loading-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

#loading-view {
    position: absolute;
    opacity: 0;
    transform: scale(0.95);
    pointer-events: none; /* Make it unclickable when hidden */
}

.main-button {
    background-color: var(--button-bg);
    border: 1px solid var(--button-border);
    color: var(--text-color);
    font-size: 24px;
    font-weight: 600;
    padding: 20px 40px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.02);
}

.main-button:hover {
    border-color: var(--button-hover-border);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}

.loading-text {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-color);
    min-height: 40px; /* Prevents layout shift */
}

.loading-text.animate {
    animation: text-pulse 2.5s ease-in-out;
}

@keyframes text-pulse {
    0% { opacity: 0; transform: translateY(10px); }
    20% { opacity: 1; transform: translateY(0); }
    80% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-10px); }
}

/* Quick Mode Toggle Styles */
.quick-mode-toggle {
    position: fixed;
    top: 60px;
    left: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    user-select: none;
    z-index: 10;
}

.quick-icon {
    stroke: var(--text-color);
}

.toggle-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--text-color);
}

input:checked + .slider:before {
    transform: translateX(20px);
}


/* Popup Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease-in-out;
    z-index: 100;
}

.modal-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: white;
    padding: 50px 60px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transform: scale(0.9);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-align: center;
}

.modal-overlay.visible .modal-content {
    transform: scale(1);
}

.modal-content h2 {
    margin: 0 0 10px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--subtle-text-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.modal-content .student-name {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 30px;
    text-transform: capitalize;
}

.modal-content .again-button {
    background-color: var(--text-color);
    color: white;
    font-size: 16px;
    font-weight: 600;
    padding: 12px 28px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.modal-content .again-button:hover {
    transform: translateY(-2px);
    background-color: #333;
}

/* Bottom Controls Styles */
.bottom-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 30px;
    align-items: center;
    z-index: 10;
    background: rgba(247, 247, 247, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 20px;
    border-radius: 20px;
    border: 1px solid rgba(224, 224, 224, 0.5);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.gender-toggle-group {
    display: flex;
    align-items: center;
    gap: 20px;
}

.control-label {
    font-family: 'Poppins', sans-serif;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-color);
    margin-right: 8px;
    letter-spacing: 0.5px;
}

.toggle-buttons {
    display: flex;
    gap: 4px;
    background: linear-gradient(145deg, #ffffff, #f0f0f0);
    padding: 6px;
    border-radius: 20px;
    border: 1px solid #e0e0e0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.toggle-btn {
    background: none;
    border: none;
    padding: 12px 20px;
    border-radius: 16px;
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.toggle-btn.active {
    background: linear-gradient(145deg, var(--text-color), #333);
    color: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transform: translateY(-1px);
}

.toggle-btn:hover:not(.active) {
    background: linear-gradient(145deg, #f8f9fa, #e9ecef);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.removal-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(145deg, #ffffff, #f8f9fa);
    border: 1px solid #e0e0e0;
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    font-weight: 600;
    padding: 12px 20px;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    letter-spacing: 0.3px;
}

.removal-btn:hover {
    border-color: var(--button-hover-border);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    background: linear-gradient(145deg, #f8f9fa, #e9ecef);
}

/* Removal Modal Styles */
.removal-content {
    max-width: 900px;
    width: 90vw;
    max-height: 85vh;
    overflow-y: auto;
    padding: 50px;
    border-radius: 24px;
    background: linear-gradient(145deg, #ffffff, #f8f9fa);
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
}

.removal-content h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-color);
    text-align: center;
}

.removal-subtitle {
    color: var(--subtle-text-color);
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    margin-bottom: 35px;
    font-weight: 500;
    text-align: center;
    letter-spacing: 0.3px;
}

.students-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    margin-bottom: 40px;
    max-height: 400px;
    overflow-y: auto;
    padding: 10px;
    border-radius: 16px;
    background: rgba(248, 250, 252, 0.6);
}

.student-card {
    background: linear-gradient(145deg, #ffffff, #f8f9fa);
    border: 2px solid transparent;
    border-radius: 16px;
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Poppins', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-color);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    letter-spacing: 0.2px;
    line-height: 1.3;
}

.student-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.student-card:hover::before {
    left: 100%;
}

.student-card:hover {
    border-color: #3b82f6;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.15);
    background: linear-gradient(145deg, #f8fafc, #e2e8f0);
}

.student-card.removed {
    background: linear-gradient(145deg, #fef2f2, #fee2e2);
    border-color: #f87171;
    color: #dc2626;
    text-decoration: line-through;
    box-shadow: 0 4px 12px rgba(248, 113, 113, 0.2);
}

.student-card.removed:hover {
    border-color: #ef4444;
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.25);
    background: linear-gradient(145deg, #fee2e2, #fecaca);
}

.removal-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    padding-top: 30px;
    border-top: 1px solid #e5e7eb;
}

.action-btn {
    border: none;
    padding: 14px 28px;
    border-radius: 16px;
    font-family: 'Poppins', sans-serif;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.3px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.action-btn.primary {
    background: linear-gradient(145deg, var(--text-color), #333);
    color: white;
}

.action-btn.primary:hover {
    background: linear-gradient(145deg, #333, #111);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.action-btn.secondary {
    background: linear-gradient(145deg, #f8f9fa, #e9ecef);
    color: var(--text-color);
    border: 1px solid var(--button-border);
}

.action-btn.secondary:hover {
    background: linear-gradient(145deg, #e9ecef, #dee2e6);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

/* Responsive adjustments */
@media (max-width: 1200px) {
    .students-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 900px) {
    .students-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .removal-content {
        padding: 30px;
        max-width: 85vw;
    }
    
    .container {
        padding: 20px 15px 140px 15px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 100px 15px 160px 15px;
        min-height: calc(100vh - 260px);
    }
    
    .header-title {
        top: 50px;
        right: 15px;
        font-size: 12px;
    }
    
    .quick-mode-toggle {
        top: 50px;
        left: 15px;
        gap: 8px;
    }
    
    .toggle-label {
        font-size: 12px;
    }
    
    .bottom-controls {
        flex-direction: column;
        gap: 15px;
        left: 15px;
        right: 15px;
        bottom: 15px;
        transform: none;
        width: calc(100% - 30px);
        padding: 12px 15px;
    }
    
    .gender-toggle-group {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }
    
    .toggle-buttons {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .toggle-btn {
        padding: 8px 16px;
        font-size: 12px;
    }
    
    .removal-btn {
        padding: 10px 16px;
        font-size: 12px;
    }
    
    .students-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .removal-content {
        padding: 25px 20px;
        max-width: 95vw;
        border-radius: 16px;
    }
    
    .student-card {
        font-size: 12px;
        padding: 14px 10px;
    }
    
    .main-button {
        font-size: 20px;
        padding: 16px 32px;
    }
    
    .loading-text {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 80px 10px 180px 10px;
    }
    
    .header-title {
        font-size: 10px;
        letter-spacing: 1px;
    }
    
    .quick-mode-toggle {
        flex-direction: column;
        gap: 5px;
        align-items: flex-start;
    }
    
    .toggle-label {
        font-size: 10px;
    }
    
    .switch {
        width: 36px;
        height: 20px;
    }
    
    .slider:before {
        height: 14px;
        width: 14px;
        left: 3px;
        bottom: 3px;
    }
    
    input:checked + .slider:before {
        transform: translateX(16px);
    }
    
    .bottom-controls {
        gap: 12px;
        padding: 10px 12px;
    }
    
    .toggle-buttons {
        gap: 2px;
        padding: 4px;
    }
    
    .toggle-btn {
        padding: 8px 12px;
        font-size: 11px;
    }
    
    .removal-btn {
        padding: 8px 12px;
        font-size: 11px;
        gap: 6px;
    }
    
    .students-grid {
        grid-template-columns: 1fr;
    }
    
    .removal-actions {
        flex-direction: column;
        gap: 15px;
    }
    
    .action-btn {
        width: 100%;
    }
    
    .main-button {
        font-size: 18px;
        padding: 14px 28px;
    }
    
    .loading-text {
        font-size: 20px;
    }
    
    .modal-content {
        padding: 30px 20px;
        margin: 20px;
    }
    
    .modal-content .student-name {
        font-size: 36px;
    }
}

@media (max-width: 320px) {
    .container {
        padding: 70px 8px 200px 8px;
    }
    
    .quick-mode-toggle {
        top: 10px;
        left: 10px;
    }
    
    .header-title {
        top: 10px;
        right: 10px;
    }
    
    .bottom-controls {
        left: 10px;
        right: 10px;
        bottom: 10px;
        width: calc(100% - 20px);
    }
    
    .main-button {
        font-size: 16px;
        padding: 12px 24px;
    }
    
    .loading-text {
        font-size: 18px;
    }
}

/* Header Credit Styles */
.footer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 12px 20px;
    z-index: 15;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.03);
}

.footer-text {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 11px;
    font-weight: 400;
    color: #9ca3af;
    text-align: center;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.developer-name {
    color: #6b7280;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0.3px;
}

/* Adjust container padding to account for top header */
.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px 120px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: calc(100vh - 200px);
    flex: 1;
}

/* Footer responsive adjustments */
@media (max-width: 768px) {
    .footer {
        padding: 6px 15px;
    }
    
    .footer-text {
        font-size: 11px;
    }
    
    .container {
        padding: 80px 15px 170px 15px;
        min-height: calc(100vh - 250px);
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 5px 10px;
    }
    
    .footer-text {
        font-size: 10px;
        letter-spacing: 0.2px;
    }
    
    .container {
        padding: 80px 10px 190px 10px;
    }
}

@media (max-width: 320px) {
    .container {
        padding: 70px 8px 210px 8px;
    }