/* CSS Reset & Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Brand Colors */
    --brand-coral: #FF6B6B;
    --brand-sunset: #FFB84D;
    --brand-purple: #9B59B6;
    --brand-teal: #4ECDC4;

    /* Light Mode */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-tertiary: #E9ECEF;
    --surface: #FFFFFF;
    --surface-elevated: #FFFFFF;

    --text-primary: #1A1A1A;
    --text-secondary: #4A4A4A;
    --text-tertiary: #6B7280;
    --text-disabled: #9CA3AF;

    --border: #E5E7EB;
    --border-strong: #D1D5DB;
    --divider: #F3F4F6;

    /* Semantic Colors */
    --success: #10B981;
    --success-light: #D1FAE5;
    --success-dark: #065F46;

    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --warning-dark: #92400E;

    --error: #EF4444;
    --error-light: #FEE2E2;
    --error-dark: #991B1B;

    --info: #3B82F6;
    --info-light: #DBEAFE;
    --info-dark: #1E40AF;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
}

/* Base Styles */
body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.hidden {
    display: none !important;
}

/* Typography */
.logo {
    font-family: 'Righteous', cursive;
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--brand-coral) 0%, var(--brand-purple) 50%, var(--brand-teal) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-family: 'Righteous', cursive;
    font-size: 1.5rem;
    color: var(--text-primary);
}

h3 {
    font-family: 'DM Sans', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    border: none;
    font-family: 'DM Sans', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-coral) 0%, var(--brand-purple) 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(155, 89, 182, 0.3);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--border-strong);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--error-dark);
}

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

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

/* Login Screen */
.login-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-lg);
}

.login-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    width: 100%;
}

.login-card .logo {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.login-subtitle {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.125rem;
}

#login-btn {
    width: 100%;
}

#login-btn svg {
    flex-shrink: 0;
}

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-email {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Main Content */
.main {
    padding: var(--spacing-xl) var(--spacing-lg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

/* Loading State */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--text-tertiary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--brand-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-tertiary);
}

.empty-state svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Choir List */
.choir-list {
    display: grid;
    gap: var(--spacing-md);
}

.choir-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-md);
    transition: all 0.2s ease;
}

.choir-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-strong);
}

.choir-info {
    flex: 1;
    min-width: 0;
}

.choir-name {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.choir-code {
    display: inline-block;
    background: linear-gradient(135deg, var(--brand-coral) 0%, var(--brand-purple) 100%);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.choir-code:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(155, 89, 182, 0.3);
}

.choir-link {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    word-break: break-all;
    display: block;
}

.choir-link a {
    color: var(--brand-purple);
    text-decoration: none;
}

.choir-link a:hover {
    text-decoration: underline;
}

.choir-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

.btn-edit {
    background: var(--info-light);
    color: var(--info-dark);
}

.btn-edit:hover {
    background: var(--info);
    color: white;
}

.btn-delete {
    background: var(--error-light);
    color: var(--error-dark);
}

.btn-delete:hover {
    background: var(--error);
    color: white;
}

.btn-qr {
    background: var(--success-light);
    color: var(--success-dark);
}

.btn-qr:hover {
    background: var(--success);
    color: white;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.2s ease-out;
}

.modal-content-small {
    max-width: 400px;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

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

.modal-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

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

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-family: 'DM Sans', sans-serif;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--brand-purple);
    box-shadow: 0 0 0 3px rgba(155, 89, 182, 0.1);
}

.form-group input::placeholder {
    color: var(--text-disabled);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.form-error {
    background: var(--error-light);
    color: var(--error-dark);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-top: var(--spacing-md);
}

/* Delete Modal */
.delete-warning {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.delete-instruction {
    margin-bottom: var(--spacing-md);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.delete-instruction code {
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--brand-purple);
}

.delete-confirm-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-align: center;
}

.delete-confirm-input:focus {
    outline: none;
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* QR Code Modal */
.qr-modal-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.qr-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xl);
    color: var(--text-tertiary);
}

.qr-image {
    width: 250px;
    height: 250px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    margin-bottom: var(--spacing-md);
}

.qr-choir-name {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.qr-choir-code {
    display: inline-block;
    background: linear-gradient(135deg, var(--brand-coral) 0%, var(--brand-purple) 100%);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: toastSlideIn 0.3s ease-out;
    max-width: 400px;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

.toast-icon {
    flex-shrink: 0;
}

.toast-success .toast-icon {
    color: var(--success);
}

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

.toast-message {
    flex: 1;
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 640px) {
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }

    .page-header .btn {
        justify-content: center;
    }

    .choir-card {
        flex-direction: column;
    }

    .choir-actions {
        width: 100%;
    }

    .choir-actions .btn {
        flex: 1;
    }

    .header-right {
        flex-direction: column;
        align-items: flex-end;
        gap: var(--spacing-xs);
    }

    .user-email {
        font-size: 0.75rem;
    }
}