/* SimpleGen AI - Clean Modern Design */

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #6366f1;
    --primary-hover: #5558e3;
    --bg-page: #f8f9fc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --radius: 16px;
    --radius-sm: 10px;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.nav-link.logout {
    color: #ef4444;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.nav-link.logout:hover {
    color: #dc2626;
}

.nav-user {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.btn-nav {
    background: var(--primary);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
}

.btn-nav:hover {
    background: var(--primary-hover);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 2rem 0 3rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.hero-title .emoji {
    margin-right: 0.5rem;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* Generator Container */
.generator-container {
    max-width: 700px;
    margin: 0 auto;
}

/* Cards */
.generator-card, .result-card, .detail-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.card-header {
    margin-bottom: 1.5rem;
}

.card-header h2 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header .icon {
    font-size: 1.25rem;
}

/* Forms */
.generator-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.form-group label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-card);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

select {
    cursor: pointer;
}

/* File Upload */
.file-upload {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 2rem;
    text-align: center;
    transition: border-color 0.2s, background 0.2s;
    cursor: pointer;
}

.file-upload:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.02);
}

.file-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.file-upload-text .icon {
    font-size: 2rem;
}

.file-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.file-upload-small {
    padding: 1.5rem 1rem;
}

.file-upload-small .file-upload-text .icon {
    font-size: 1.5rem;
}

/* Buttons */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background 0.2s, transform 0.1s;
    text-decoration: none;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
}

.btn-secondary {
    background: var(--bg-page);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: background 0.2s;
}

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

.btn-small {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    background: var(--bg-page);
    border: 1px solid var(--border);
    border-radius: 6px;
    text-decoration: none;
    color: var(--text-primary);
    transition: background 0.2s;
}

.btn-small:hover {
    background: var(--border);
}

.btn-icon {
    font-size: 1.1em;
}

/* Result Image */
.result-image-container {
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 1rem;
}

.result-image {
    width: 100%;
    display: block;
}

.result-actions {
    display: flex;
    gap: 0.75rem;
}

/* Features Section */
.features-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.section-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Auth Pages */
.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 200px);
    padding: 2rem;
}

.auth-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.auth-header h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* History Page */
.history-container {
    max-width: 800px;
    margin: 0 auto;
}

.empty-state {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 4rem 2rem;
    text-align: center;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state h2 {
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.history-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.history-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
}

.history-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.history-card-thumbnail {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--bg-page);
}

.history-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.history-card-thumbnail .history-card-icon {
    width: 100%;
    height: 100%;
    background: none;
}

.history-card-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    background: var(--bg-page);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.history-card-content {
    flex: 1;
    min-width: 0;
}

.history-type-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.history-type-badge.large {
    font-size: 0.9rem;
    padding: 0.4rem 1rem;
}

.history-prompt {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.history-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Detail Page */
.detail-container {
    max-width: 800px;
    margin: 0 auto;
}

.back-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    margin-bottom: 1.5rem;
}

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

.detail-header {
    margin-bottom: 2rem;
}

.detail-header h1 {
    font-size: 1.5rem;
    margin: 0.75rem 0 0.5rem;
}

.detail-date {
    color: var(--text-secondary);
}

.detail-card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.prompt-text {
    color: var(--text-primary);
    line-height: 1.6;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.image-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg-page);
}

.image-item img {
    width: 100%;
    display: block;
}

.image-actions {
    padding: 0.75rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Alert */
.alert {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

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

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

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