* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-surface-hover: #1a1a1a;
    --color-border: #262626;
    --color-border-hover: #404040;
    --color-text: #fafafa;
    --color-text-muted: #a1a1aa;
    --color-text-subtle: #71717a;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-light: rgba(59, 130, 246, 0.1);
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-booklet: #f59e0b;
    --color-auth: #8b5cf6;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.6;
}

.hidden {
    display: none !important;
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.logo-icon {
    font-size: 28px;
    color: var(--color-primary);
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.03em;
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: 12px;
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-border);
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-surface);
    border-color: var(--color-border-hover);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-full {
    width: 100%;
}

.btn-link {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
}

.btn-link:hover {
    text-decoration: underline;
}

/* Hero */
.hero {
    text-align: center;
    padding: 80px 0 50px;
}

.hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 500px;
    margin: 0 auto;
}

/* Apps Grid */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    padding: 40px 0;
    flex: 1;
}

/* App Card */
.app-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 32px;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-booklet), var(--color-warning));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.app-card:first-child::before {
    background: linear-gradient(90deg, var(--color-booklet), #fbbf24);
}

.app-card:last-child::before {
    background: linear-gradient(90deg, var(--color-auth), #a78bfa);
}

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

.app-card:hover::before {
    opacity: 1;
}

.app-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

.app-icon svg {
    width: 32px;
    height: 32px;
}

.booklet-icon {
    color: var(--color-booklet);
    border-color: rgba(245, 158, 11, 0.3);
}

.auth-icon {
    color: var(--color-auth);
    border-color: rgba(139, 92, 246, 0.3);
}

.app-content {
    flex: 1;
}

.app-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.app-content p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-list li {
    font-size: 14px;
    color: var(--color-text-subtle);
}

.auth-benefits {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.benefit {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-text-muted);
}

.benefit-icon {
    font-size: 16px;
}

.app-link, .app-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: gap var(--transition-fast);
}

.app-card:hover .app-link,
.app-card:hover .app-link-btn {
    gap: 12px;
}

/* Auth Card - different state when logged in */
.auth-card.logged-in {
    opacity: 0.6;
    pointer-events: none;
}

/* Footer */
.footer {
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    font-size: 13px;
    color: var(--color-text-subtle);
}

/* =====================================================
   MODAL STYLES
   ===================================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 420px;
    position: relative;
    transform: scale(0.95) translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.modal-header {
    text-align: center;
    padding: 40px 32px 24px;
    border-bottom: 1px solid var(--color-border);
}

.modal-logo {
    font-size: 32px;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.modal-header p {
    color: var(--color-text-muted);
    font-size: 14px;
}

.modal-body {
    padding: 32px;
}

/* Google Button */
.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 12px 20px;
    background: white;
    color: #1f1f1f;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-google:hover {
    background: #f5f5f5;
    box-shadow: var(--shadow-sm);
}

/* Divider */
.divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 24px 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.divider span {
    font-size: 13px;
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

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

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* Error Message */
.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-error);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    margin-bottom: 20px;
    display: none;
}

.error-message.visible {
    display: block;
}

/* Submit Button with Spinner */
.btn .spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn.loading .spinner {
    display: block;
}

.btn.loading #submitBtnText {
    display: none;
}

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

/* Auth Switch */
.auth-switch {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 14px;
    color: var(--color-text-muted);
}

.auth-switch .btn-link {
    margin-left: 4px;
}

/* Forgot Password */
.forgot-password {
    text-align: center;
    margin-top: 16px;
}

.forgot-password .btn-link {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* =====================================================
   LOADING OVERLAY
   ===================================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-overlay p {
    color: var(--color-text-muted);
    font-size: 14px;
}

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 16px;
        padding: 16px 0;
    }

    .hero {
        padding: 50px 0 30px;
    }

    .apps-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .app-card {
        padding: 24px;
    }

    .modal {
        max-width: 100%;
        margin: 0;
        border-radius: var(--radius-lg);
    }

    .modal-header {
        padding: 32px 24px 20px;
    }

    .modal-body {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .auth-buttons {
        flex-direction: column;
        width: 100%;
    }

    .auth-buttons .btn {
        width: 100%;
    }

    .user-name {
        display: none;
    }
}