/* ===================================
   CSS Variables for Easy Customization
   =================================== */
:root {
    --primary-color: #FF6B35;
    --secondary-color: #004E89;
    --success-color: #06D6A0;
    --error-color: #EF476F;
    --warning-color: #FFD166;
    --text-dark: #2B2D42;
    --text-light: #8D99AE;
    --background: #F8F9FA;
    --white: #FFFFFF;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--background);
    color: var(--text-dark);
}

/* ===================================
   App Container
   =================================== */
#app {
    width: 100%;
    height: 100%;
    position: relative;
}

/* ===================================
   Screen Management
   =================================== */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.screen.active {
    display: flex;
    opacity: 1;
    justify-content: center;
    align-items: center;
}

/* ===================================
   Form Screen
   =================================== */
#formScreen {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
}

.container {
    width: 90%;
    max-width: 600px;
    padding: 40px;
    background: var(--white);
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
}

/* Logo */
.logo-container {
    margin-bottom: 30px;
}

.logo {
    max-width: 150px;
    height: auto;
}

/* Headings */
.main-heading {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.subheading {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 40px;
}

/* Email Form */
.email-form {
    margin-bottom: 20px;
}

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

.email-input {
    width: 100%;
    padding: 20px 24px;
    font-size: 20px;
    border: 3px solid #E0E0E0;
    border-radius: var(--border-radius);
    outline: none;
    transition: var(--transition);
    background: var(--white);
}

.email-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.1);
}

.email-input::placeholder {
    color: #BDBDBD;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 24px;
    font-size: 22px;
    font-weight: 600;
    color: var(--white);
    background: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    background: #E85A2A;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
}

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

.submit-btn:disabled {
    background: #BDBDBD;
    cursor: not-allowed;
    transform: none;
}

/* Button Loading State */
.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Status Messages */
.status-message {
    min-height: 60px;
    padding: 16px;
    margin-top: 20px;
    border-radius: var(--border-radius);
    font-size: 16px;
    line-height: 1.5;
    transition: var(--transition);
}

.status-message.error {
    background: #FFEBEE;
    color: var(--error-color);
    border: 2px solid var(--error-color);
}

.status-message.success {
    background: #E8F5E9;
    color: #2E7D32;
    border: 2px solid var(--success-color);
}

.status-message.info {
    background: #E3F2FD;
    color: #1565C0;
    border: 2px solid #2196F3;
}

.status-message.warning {
    background: #FFF8E1;
    color: #F57C00;
    border: 2px solid var(--warning-color);
}

/* Offline Info */
.offline-info {
    margin-top: 20px;
    padding: 12px;
    background: #FFF8E1;
    border-radius: var(--border-radius);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    font-size: 14px;
}

.offline-badge {
    background: var(--warning-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
}

.queue-count {
    color: var(--text-light);
}

/* ===================================
   Confirmation Screen
   =================================== */
#confirmationScreen {
    background: linear-gradient(135deg, var(--success-color) 0%, #04A777 100%);
}

.confirmation-container {
    width: 90%;
    max-width: 700px;
    padding: 60px 40px;
    background: var(--white);
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.confirmation-icon {
    font-size: 120px;
    color: var(--success-color);
    margin-bottom: 30px;
    animation: scaleIn 0.5s ease;
}

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

.confirmation-heading {
    font-size: 56px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
    letter-spacing: -1px;
    line-height: 1.2;
}

.confirmation-text {
    font-size: 28px;
    color: var(--text-light);
    margin-bottom: 50px;
}

.reset-btn {
    padding: 20px 40px;
    font-size: 18px;
    font-weight: 600;
    color: var(--white);
    background: var(--secondary-color);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.reset-btn:hover {
    background: #003D6B;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 78, 137, 0.3);
}

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

/* ===================================
   Control Panel
   =================================== */
.control-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.toggle-panel-btn {
    width: 50px;
    height: 50px;
    font-size: 24px;
    background: var(--white);
    border: 2px solid #E0E0E0;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.toggle-panel-btn:hover {
    background: var(--background);
    transform: rotate(90deg);
}

.panel-content {
    position: absolute;
    top: 60px;
    right: 0;
    width: 320px;
    max-height: 80vh;
    overflow-y: auto;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    padding: 20px;
}

.panel-content h3 {
    margin-bottom: 20px;
    color: var(--text-dark);
    font-size: 18px;
    border-bottom: 2px solid #E0E0E0;
    padding-bottom: 10px;
}

.panel-section {
    margin-bottom: 16px;
}

.panel-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-dark);
    cursor: pointer;
}

.panel-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.panel-input {
    width: 100%;
    padding: 10px;
    font-size: 14px;
    border: 2px solid #E0E0E0;
    border-radius: 8px;
    margin-top: 8px;
}

.panel-btn {
    width: 100%;
    padding: 12px;
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    background: var(--secondary-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 8px;
    transition: var(--transition);
}

.panel-btn:hover {
    background: #003D6B;
}

.panel-btn.danger {
    background: var(--error-color);
}

.panel-btn.danger:hover {
    background: #D63554;
}

.stats {
    background: var(--background);
    padding: 12px;
    border-radius: 8px;
}

.stat {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
}

.stat-label {
    color: var(--text-light);
}

.stat-value {
    font-weight: 600;
    color: var(--text-dark);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .main-heading {
        font-size: 36px;
    }
    
    .subheading {
        font-size: 18px;
    }
    
    .confirmation-heading {
        font-size: 42px;
    }
    
    .confirmation-text {
        font-size: 22px;
    }
    
    .container {
        padding: 30px 20px;
    }
}

/* iPad Specific Optimizations */
@media (min-width: 768px) and (max-width: 1024px) {
    .container {
        max-width: 700px;
    }
    
    .main-heading {
        font-size: 54px;
    }
    
    .email-input {
        font-size: 24px;
        padding: 24px;
    }
    
    .submit-btn {
        font-size: 26px;
        padding: 28px;
    }
}

/* Prevent text selection in kiosk mode */
body.kiosk-mode {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body.kiosk-mode .email-input {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

/* ===================================
   Custom Modal Dialogs (iPad-friendly)
   =================================== */
.custom-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.custom-modal.active {
    display: block;
    opacity: 1;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.modal-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: scale(0.9) translateY(-20px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.modal-content {
    background: var(--white);
    border-radius: 20px;
    padding: 40px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.modal-icon {
    font-size: 64px;
    margin-bottom: 20px;
    animation: iconBounce 0.5s ease;
}

@keyframes iconBounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.modal-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.modal-message {
    font-size: 18px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 30px;
    white-space: pre-line;
    max-height: 400px;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 10px;
    text-align: left;
    border-radius: 8px;
    background: #f9f9f9;
}

/* Scrollbar styling for modal */
.modal-message::-webkit-scrollbar {
    width: 8px;
}

.modal-message::-webkit-scrollbar-track {
    background: #e0e0e0;
    border-radius: 4px;
}

.modal-message::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.modal-message::-webkit-scrollbar-thumb:hover {
    background: #E85A2A;
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.modal-btn {
    min-width: 120px;
    padding: 16px 32px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    touch-action: manipulation;
}

.modal-btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.modal-btn-primary:hover {
    background: #E85A2A;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
}

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

.modal-btn-secondary {
    background: #E0E0E0;
    color: var(--text-dark);
}

.modal-btn-secondary:hover {
    background: #D0D0D0;
}

.modal-btn-secondary:active {
    transform: scale(0.95);
}

/* Modal variations */
.modal-content.modal-success .modal-icon {
    color: var(--success-color);
}

.modal-content.modal-error .modal-icon {
    color: var(--error-color);
}

.modal-content.modal-warning .modal-icon {
    color: var(--warning-color);
}

.modal-content.modal-confirm .modal-icon {
    color: var(--primary-color);
}

/* iPad-specific optimizations */
@media (min-width: 768px) and (max-width: 1024px) {
    .modal-content {
        max-width: 600px;
        padding: 50px;
    }
    
    .modal-icon {
        font-size: 80px;
    }
    
    .modal-title {
        font-size: 32px;
    }
    
    .modal-message {
        font-size: 20px;
        max-height: 500px;
    }
    
    .modal-btn {
        min-width: 150px;
        padding: 20px 40px;
        font-size: 20px;
    }
}