/* ========== Global Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2d3748;
    --accent-color: #667eea;
    --accent-light: #764ba2;
    --success-color: #48bb78;
    --dark-bg: #1a202c;
    --light-bg: #f7fafc;
    --border-color: #e2e8f0;
    --text-dark: #1a202c;
    --text-mid: #4a5568;
    --text-light: #718096;
    --card-bg: #ffffff;
    --card-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', 'Helvetica Neue', sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--light-bg);
    letter-spacing: -0.015em;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== Navigation ========== */
.navbar {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(20px);
    color: var(--text-dark);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 0 0 rgba(0, 0, 0, 0.03);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.375rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-mid);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9375rem;
    letter-spacing: -0.01em;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.nav-links a:hover::after {
    width: 100%;
}

/* ========== Authentication Styles ========== */
.auth-button {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
    color: white;
    border: none;
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: -0.01em;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.25);
}

.auth-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.35);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0;
    background: transparent;
    border-radius: 0;
    border: none;
    transition: var(--transition);
}

.user-info:hover .user-photo {
    transform: scale(1.05);
}

.user-photo {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.user-info:hover .user-photo {
    border-color: var(--accent-color);
}

#userName {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-dark);
    letter-spacing: -0.01em;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sign-out-btn {
    background: transparent;
    border: none;
    color: var(--text-light);
    padding: 0;
    border-radius: 0;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: -0.01em;
    text-decoration: none;
}

.sign-out-btn:hover {
    color: var(--accent-color);
}

/* ========== Hero Section ========== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
    color: white;
    padding: 140px 20px 120px;
    text-align: center;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-content h2 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 400;
    letter-spacing: -0.01em;
}

.cta-button {
    display: inline-block;
    background-color: white;
    color: var(--accent-color);
    padding: 16px 48px;
    text-decoration: none;
    border-radius: 50px;
    margin-top: 2rem;
    font-size: 1.0625rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    letter-spacing: -0.01em;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25);
}

/* ========== Shop Section ========== */
.shop {
    padding: 120px 20px;
    background-color: white;
}

.shop h2 {
    text-align: center;
    font-size: 2.75rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
    font-weight: 700;
    letter-spacing: -0.04em;
}

.shop h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    margin: 1.5rem auto 3rem;
    border-radius: 2px;
}

/* Filter Buttons */
.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 28px;
    border: 2px solid transparent;
    background-color: var(--light-bg);
    color: var(--text-mid);
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.9375rem;
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

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

.filter-btn.active {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.filter-btn.active::before {
    opacity: 1;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    opacity: 1;
    animation: fadeIn 0.4s ease;
    position: relative;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 16px;
    padding: 2px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

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

.product-card.hidden {
    display: none;
}

.product-image {
    width: 100%;
    height: 280px;
    background: linear-gradient(135deg, #f8f9fc 0%, #eef2f7 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    position: relative;
    overflow: hidden;
}

.product-image::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.08) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

.product-image-img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    object-position: center;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.product-info {
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

.product-category {
    display: inline-block;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    width: fit-content;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.product-name {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.product-description {
    color: var(--text-light);
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
    line-height: 1.7;
}

.product-price {
    font-size: 1.75rem;
    color: var(--text-dark);
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.buy-button {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
    padding: 14px 24px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
    display: block;
    font-size: 1rem;
    letter-spacing: -0.01em;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.buy-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.buy-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.buy-button:hover::before {
    left: 100%;
}

/* ========== About Section ========== */
.about {
    padding: 120px 20px;
    background: linear-gradient(to bottom, white 0%, var(--light-bg) 100%);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, transparent, var(--accent-color), transparent);
}

.about h2 {
    text-align: center;
    font-size: 2.75rem;
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    color: var(--text-dark);
}

.about h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    margin: 1.5rem auto 3rem;
    border-radius: 2px;
}

.about p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    color: var(--text-mid);
}

/* ========== Contact Section ========== */
.contact {
    padding: 120px 20px;
    background-color: white;
    text-align: center;
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.contact h2 {
    font-size: 2.75rem;
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.contact h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    margin: 1.5rem auto 3rem;
    border-radius: 2px;
}

.contact p {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-mid);
}

.contact a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    position: relative;
    transition: var(--transition);
}

.contact a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    transition: width 0.3s ease;
}

.contact a:hover {
    color: var(--accent-light);
}

.contact a:hover::after {
    width: 100%;
}

/* ========== Footer ========== */
.footer {
    background: linear-gradient(135deg, var(--dark-bg) 0%, #0f1419 100%);
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    padding: 3rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
}

.footer p {
    font-size: 0.9375rem;
    opacity: 0.8;
    letter-spacing: 0.01em;
}

/* ========== Sell Section & Forms ========== */
.sell-section, .my-listings-section {
    padding: 120px 20px;
    background-color: var(--light-bg);
}

.sell-section h2, .my-listings-section h2 {
    text-align: center;
    font-size: 2.75rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-mid);
    margin-bottom: 3rem;
}

.listing-form {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
    letter-spacing: -0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background-color: white;
    color: var(--text-dark);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group small {
    margin-top: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-light);
}

.submit-listing-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.submit-listing-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.my-listings-section {
    background-color: white;
}

.delete-listing-btn {
    background: #ef4444;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
}

.delete-listing-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.user-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(72, 187, 120, 0.1), rgba(52, 211, 153, 0.1));
    color: var(--success-color);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

/* ========== Listing Form Sections ========== */
.listing-form h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.image-upload-section,
.card-details-section,
.grading-section,
.pricing-section {
    margin-bottom: 2rem;
}

.pricing-note {
    font-size: 0.875rem;
    color: var(--text-mid);
    margin-top: 0.5rem;
    font-style: italic;
}

/* Image Upload Styles */
.image-upload-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.image-upload-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.image-upload-group label {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.9375rem;
}

.image-upload-box {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    background-color: var(--light-bg);
    cursor: pointer;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-upload-box:hover {
    border-color: var(--accent-color);
    background-color: rgba(102, 126, 234, 0.05);
}

.image-upload-box.has-image {
    border-style: solid;
    border-color: var(--accent-color);
}

.image-upload-box input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    pointer-events: none;
}

.upload-icon {
    font-size: 2.5rem;
}

.upload-placeholder span:last-child {
    font-size: 0.875rem;
    font-weight: 500;
}

.image-preview {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.image-upload-box.has-image .upload-placeholder {
    display: none;
}

/* ========== Responsive Design ========== */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .shop h2 {
        font-size: 2rem;
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1.5rem;
    }

    .product-image {
        height: 200px;
        font-size: 3rem;
    }

    .filter-buttons {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .listing-form {
        padding: 2rem 1.5rem;
    }

    .image-upload-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .image-upload-box {
        aspect-ratio: 4/3;
        max-height: 200px;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .logo h1 {
        font-size: 1.3rem;
    }

    .hero-content h2 {
        font-size: 1.5rem;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        flex-direction: column;
    }

    .filter-btn {
        width: 100%;
    }
}

/* ========== Auth Modal ========== */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.auth-modal-content {
    position: relative;
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.auth-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.75rem;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
    padding: 0.25rem;
}

.auth-modal-close:hover {
    color: var(--text-dark);
}

/* Auth Tabs */
.auth-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    background: none;
    border: none;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.auth-tab::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.auth-tab:hover {
    color: var(--text-mid);
}

.auth-tab.active {
    color: var(--accent-color);
}

.auth-tab.active::after {
    transform: scaleX(1);
}

/* Auth Forms */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.auth-form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.auth-form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-dark);
}

.auth-form-group input {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.auth-form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.auth-form-description {
    font-size: 0.9375rem;
    color: var(--text-mid);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.forgot-password-link {
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    padding: 0;
    transition: var(--transition);
}

.forgot-password-link:hover {
    color: var(--accent-light);
    text-decoration: underline;
}

.back-to-login-link {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 0.5rem;
    transition: var(--transition);
}

.back-to-login-link:hover {
    color: var(--accent-color);
}

.auth-submit-btn {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.auth-submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

/* Auth Message */
.auth-message {
    padding: 0.875rem 1rem;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.auth-message.error {
    background-color: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.auth-message.success {
    background-color: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

/* Auth Divider */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--text-light);
    font-size: 0.875rem;
}

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

/* Google Sign In Button */
.google-signin-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: white;
    color: var(--text-dark);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.google-signin-btn:hover {
    background-color: var(--light-bg);
    border-color: var(--text-light);
}

.google-signin-btn svg {
    flex-shrink: 0;
}

/* User Initial Avatar (for users without photo) */
.user-initial {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Auth Modal Responsive */
@media (max-width: 480px) {
    .auth-modal-content {
        padding: 1.5rem;
        margin: 10px;
        max-height: 90vh;
        overflow-y: auto;
    }

    .auth-tabs {
        margin-bottom: 1rem;
    }

    .auth-tab {
        padding: 0.75rem;
        font-size: 0.9375rem;
    }
}