/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Navbar */
.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

.navbar-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.navbar-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.navbar-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.navbar-link:hover {
    color: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* Footer */
.footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Features */
.features {
    padding: 4rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.feature h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

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

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

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

.btn-block {
    width: 100%;
}

.btn-link {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

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

.btn-delete {
    color: var(--danger-color);
}

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

.auth-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

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

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

.auth-footer {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-secondary);
}

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

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

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

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group small {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-error {
    background-color: #fee2e2;
    color: var(--danger-color);
    padding: 0.75rem;
    border-radius: 0.375rem;
    display: none;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
}

/* Timeline */
.timeline-container {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-group {
    margin-bottom: 3rem;
}

.timeline-label {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.timeline-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Bookmark Cards */
.bookmark-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.bookmark-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.bookmark-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    flex: 1;
}

.bookmark-title:hover {
    text-decoration: underline;
}

.bookmark-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.bookmark-description {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.bookmark-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.tag {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
}

.bookmark-actions {
    display: flex;
    gap: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

/* Bookmark List */
.bookmarks-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Bookmark Form */
.bookmark-form-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.bookmark-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Utility Classes */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state a {
    color: var(--primary-color);
    text-decoration: none;
}

.empty-state a:hover {
    text-decoration: underline;
}

.error {
    background-color: #fee2e2;
    color: var(--danger-color);
    padding: 1rem;
    border-radius: 0.375rem;
    text-align: center;
}

/* Decryption States */
.decrypt-placeholder {
    color: #9ca3af;
    font-style: italic;
    font-size: 0.875rem;
}

.bookmark-card:not(.decrypted) {
    opacity: 0.7;
    transition: opacity 0.3s ease-in;
}

.bookmark-card.decrypted {
    opacity: 1;
}

.bookmark-card.decrypt-error {
    border-left: 3px solid var(--danger-color);
    background-color: #fef2f2;
}

.bookmark-card.decrypt-error .bookmark-title {
    color: var(--danger-color);
    cursor: not-allowed;
}

.bookmark-card.decrypt-error .bookmark-title:hover {
    text-decoration: none;
}

/* Error Banner */
.error-banner {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.error-banner p {
    margin: 0 0 0.5rem 0;
    color: var(--danger-color);
    font-weight: 600;
}

.error-banner ul {
    margin: 0;
    padding-left: 1.5rem;
    color: #dc2626;
}

.error-banner ul li {
    margin-bottom: 0.25rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .navbar-menu {
        gap: 1rem;
    }

    .navbar-link {
        font-size: 0.875rem;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .bookmark-header {
        flex-direction: column;
    }

    .bookmark-date {
        white-space: normal;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }
}