:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --background: #F9FAFB;
    --surface: #FFFFFF;
    --text-main: #111827;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --error: #EF4444;
    --success: #10B981;
    --radius: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Explicitly prevent dark mode */
    color-scheme: light;
}

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-main);
}

p {
    color: var(--text-muted);
}

/* Layout Containers */
.container {
    width: 100%;
    max-width: 480px; /* Mobile focused max width */
    margin: 0 auto;
    padding: 2rem 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.admin-container {
    max-width: 1000px;
    padding: 3rem 1.5rem;
}

/* Glassmorphism Card */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
    animation: fadeIn 0.8s ease backwards;
}

.form-group:nth-child(1) { animation-delay: 0.1s; }
.form-group:nth-child(2) { animation-delay: 0.2s; }
.form-group:nth-child(3) { animation-delay: 0.3s; }
.form-group:nth-child(4) { animation-delay: 0.4s; }
.form-group:nth-child(5) { animation-delay: 0.5s; }

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    color: var(--text-main);
    background-color: var(--background);
    transition: all 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
    background-color: var(--surface);
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 2.35rem; /* Adjusted based on label height */
    color: var(--text-muted);
    width: 20px;
    height: 20px;
    transition: color 0.2s ease;
}

.form-input:focus + .input-icon,
.form-input:focus ~ .input-icon {
    color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

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

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

/* Loading Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    display: none;
}

.btn.loading .spinner {
    display: inline-block;
}
.btn.loading .btn-text {
    display: none;
}

/* Brand Header */
.brand-header {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: slideDown 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.brand-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    color: white;
    box-shadow: var(--shadow-md);
}

/* Animations */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Status Message */
.status-msg {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    display: none;
    align-items: center;
    gap: 0.5rem;
    animation: slideUp 0.3s ease;
}

.status-msg.error {
    background-color: #FEF2F2;
    color: var(--error);
    border: 1px solid #FECACA;
    display: flex;
}

.status-msg.success {
    background-color: #ECFDF5;
    color: var(--success);
    border: 1px solid #A7F3D0;
    display: flex;
}

/* Admin Table */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    margin-top: 2rem;
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.data-table th, .data-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background-color: var(--background);
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.data-table tbody tr {
    transition: background-color 0.2s ease;
}

.data-table tbody tr:hover {
    background-color: var(--background);
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-6 { margin-bottom: 1.5rem; }
.d-none { display: none !important; }

/* Thank You Specific */
.success-icon-large {
    width: 80px;
    height: 80px;
    background-color: #ECFDF5;
    color: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    animation: scaleIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.info-box {
    background-color: #EFF6FF;
    border: 1px solid #BFDBFE;
    color: #1E3A8A;
    padding: 1rem;
    border-radius: 12px;
    margin: 1.5rem 0;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    text-align: left;
    font-size: 0.875rem;
}

.info-box i {
    flex-shrink: 0;
    margin-top: 0.125rem;
}