/* TabSaver Core Design System */

:root {
    --bg-main: #0b0f19;
    --bg-card: #131b2e;
    --bg-card-hover: #18233c;
    --bg-input: #0d1424;
    --bg-sidebar: #0f1626;
    
    --border-color: #1e293d;
    --border-focus: #38bdf8;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-blue: #7dd3fc;
    --accent-blue-hover: #38bdf8;
    --accent-dark-btn: #2563eb;
    
    --badge-work: #f43f5e;
    --badge-reading: #38bdf8;
    --badge-research: #10b981;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-blue-hover);
}

/* ==================== Auth Layout ==================== */

.auth-body {
    background: radial-gradient(circle at 70% 30%, #152238 0%, #0b0f19 70%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-container {
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
}

.auth-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px 32px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.auth-icon-badge {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px auto;
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
}

.auth-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 8px;
}

.auth-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.5;
    margin-bottom: 28px;
}

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

.form-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.form-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.form-link {
    font-size: 12px;
    font-weight: 500;
    color: var(--accent-blue);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    pointer-events: none;
    display: flex;
    align-items: center;
}

.input-icon-right {
    position: absolute;
    right: 14px;
    color: var(--text-muted);
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    display: flex;
    align-items: center;
}

.input-icon-right:hover {
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 14px 12px 42px;
    font-size: 14px;
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.form-input::placeholder {
    color: #475569;
}

.btn-primary {
    width: 100%;
    background-color: var(--accent-blue);
    color: #090d16;
    font-weight: 600;
    font-size: 15px;
    padding: 13px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background-color 0.2s, transform 0.1s;
    text-decoration: none;
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    color: #090d16;
}

.btn-secondary {
    display: inline-block;
    background-color: #1e293b;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
    padding: 12px 20px;
    border-radius: 10px;
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: background-color 0.2s;
}

.btn-secondary:hover {
    background-color: #334155;
    color: #ffffff;
}

.separator {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.8px;
}

.separator::before, .separator::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.separator span {
    padding: 0 12px;
}

.social-btns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.btn-social {
    background-color: #162032;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
}

.btn-social:hover {
    background-color: #1d2b44;
}

.auth-footer {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
}

.alert-message {
    padding: 12px 14px;
    border-radius: 10px;
    font-size: 13px;
    margin-bottom: 20px;
    line-height: 1.4;
    display: none;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    display: block;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
    display: block;
}

.password-rules {
    background: #0f1624;
    border: 1px solid #1e293b;
    border-radius: 8px;
    padding: 10px 12px;
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-muted);
}

.password-rules ul {
    list-style: none;
    padding: 0;
    margin: 4px 0 0 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.password-rules li {
    display: flex;
    align-items: center;
    gap: 4px;
}

.password-rules li.valid {
    color: #34d399;
}

/* ==================== Main App Layout ==================== */

.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 10px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s;
}

.nav-item a:hover {
    background-color: #172238;
    color: #ffffff;
}

.nav-item.active a {
    background-color: #25344d;
    color: #ffffff;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.main-content {
    flex: 1;
    padding: 24px 36px;
    overflow-y: auto;
}

.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.search-box {
    position: relative;
    width: 420px;
}

.search-input {
    width: 100%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 14px 10px 40px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

.search-input:focus {
    border-color: var(--border-focus);
}

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

.profile-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #38bdf8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #0b0f19;
}

.profile-info {
    text-align: right;
}

.profile-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.profile-plan {
    font-size: 11px;
    color: var(--text-muted);
}

.header-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 6px;
}

.page-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

.filter-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.tag-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.tag-btn:hover {
    border-color: #334155;
    color: #ffffff;
}

.tag-btn.active {
    background-color: #1e293b;
    border-color: var(--accent-blue);
    color: #ffffff;
}

.tag-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.tag-dot.work { background-color: var(--badge-work); }
.tag-dot.reading { background-color: var(--badge-reading); }
.tag-dot.research { background-color: var(--badge-research); }

.tabs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.tab-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 140px;
    transition: transform 0.2s, border-color 0.2s;
    position: relative;
}

.tab-card:hover {
    transform: translateY(-2px);
    border-color: #334155;
    background-color: var(--bg-card-hover);
}

.tab-card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.tab-favicon {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    flex-shrink: 0;
}

.tab-info {
    flex: 1;
    overflow: hidden;
}

.tab-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.tab-domain {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tab-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
}

.tab-tag-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: #101726;
    border: 1px solid var(--border-color);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.tab-time {
    font-size: 12px;
    color: var(--text-muted);
}

.tab-actions {
    position: absolute;
    top: 14px;
    right: 14px;
    display: none;
    gap: 6px;
}

.tab-card:hover .tab-actions {
    display: flex;
}

.btn-icon-action {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.btn-icon-action:hover {
    color: #ffffff;
    border-color: var(--accent-blue);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    padding: 28px;
}