/* Elena - Dark Theme */

:root {
    --bg-primary: #0f0f13;
    --bg-secondary: #1a1a24;
    --bg-tertiary: #24243a;
    --border: #2a2a40;
    --text-primary: #e8e8f0;
    --text-secondary: #9090b0;
    --accent: #6c5ce7;
    --accent-hover: #7c6cf7;
    --accent-glow: rgba(108, 92, 231, 0.25);
    --success: #00cec9;
    --warning: #fdcb6e;
    --error: #e17055;
    --radius: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
    cursor: pointer;
}

/* Buttons */
.btn {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    padding: 6px 14px;
    transition: all 0.15s;
}

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

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-tiny {
    font-size: 0.75rem;
    padding: 2px 8px;
}

.btn-sm {
    font-size: 0.8rem;
    padding: 5px 12px;
}

.btn-lg {
    font-size: 1rem;
    padding: 10px 28px;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

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

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

.btn-danger:hover {
    background: var(--error);
    color: #fff;
}

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

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

/* Login Overlay */
.login-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
}

.login-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    text-align: center;
    min-width: 340px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

.login-logo {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: 700;
}

.login-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.login-google-btn {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

.login-error {
    font-size: 0.82rem;
    color: var(--error);
    margin-top: 4px;
}

/* Header user */
.header-user {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-user-pic {
    width: 26px;
    height: 26px;
    border-radius: 50%;
}

.header-user-name {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.header-signout {
    font-size: 0.7rem;
    padding: 2px 8px;
}

/* Views */
.view {
    max-width: 800px;
    margin: 0 auto;
    padding: 24px 20px;
}

.view-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.view-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    flex: 1;
}

/* Forms */
.form-input, .form-textarea {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-textarea {
    resize: vertical;
    min-height: 60px;
}

.inline-form {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.inline-form-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Deck Grid */
.deck-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
}

.deck-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px;
    cursor: pointer;
    transition: all 0.15s;
    position: relative;
}

.deck-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.deck-card-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.deck-card-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    min-height: 18px;
}

.deck-card-stats {
    display: flex;
    gap: 12px;
    font-size: 0.75rem;
}

.deck-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.deck-stat-value {
    font-weight: 700;
    font-size: 1.1rem;
}

.deck-stat-value.due {
    color: var(--accent);
}

.deck-stat-value.learned {
    color: var(--success);
}

.deck-stat-value.new {
    color: var(--warning);
}

.deck-stat-label {
    color: var(--text-secondary);
    font-size: 0.7rem;
}

.deck-card-badges {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 6px;
}

.badge {
    font-size: 0.65rem;
    padding: 1px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.badge-draft {
    background: rgba(253, 203, 110, 0.2);
    color: var(--warning);
}

.badge-published {
    background: rgba(0, 206, 201, 0.2);
    color: var(--success);
}

.badge-reversed {
    background: rgba(108, 92, 231, 0.2);
    color: var(--accent);
}

.deck-card-actions {
    display: flex;
    gap: 6px;
    margin-top: 10px;
}

/* Study */
.study-progress {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.study-card-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.study-card {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.study-direction-badge {
    position: absolute;
    top: 12px;
    right: 12px;
}

.study-card-content {
    font-size: 1.3rem;
    text-align: center;
    word-break: break-word;
    white-space: pre-wrap;
}

.study-reveal-container {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.study-hint {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.study-answer {
    width: 100%;
    margin-top: 16px;
}

.study-answer-divider {
    width: 60%;
    height: 1px;
    background: var(--border);
    margin: 0 auto 16px;
}

.study-answer-content {
    font-size: 1.2rem;
    text-align: center;
    color: var(--success);
    margin-bottom: 24px;
    word-break: break-word;
    white-space: pre-wrap;
}

.rating-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-rate {
    min-width: 80px;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.rate-key {
    font-size: 0.65rem;
    opacity: 0.5;
    font-weight: 400;
}

.btn-again {
    border-color: var(--error);
    color: var(--error);
}

.btn-again:hover {
    background: var(--error);
    color: #fff;
}

.btn-hard {
    border-color: var(--warning);
    color: var(--warning);
}

.btn-hard:hover {
    background: var(--warning);
    color: #1a1a24;
}

.btn-good {
    border-color: var(--success);
    color: var(--success);
}

.btn-good:hover {
    background: var(--success);
    color: #1a1a24;
}

.btn-easy {
    border-color: #55efc4;
    color: #55efc4;
}

.btn-easy:hover {
    background: #55efc4;
    color: #1a1a24;
}

.study-complete {
    text-align: center;
    padding: 60px 20px;
}

.study-complete-icon {
    font-size: 3rem;
    color: var(--success);
    margin-bottom: 12px;
}

.study-complete h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.study-complete p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* Deck Management */
.manage-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px;
    margin-bottom: 16px;
}

.manage-section h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.manage-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.manage-section-header h3 {
    margin-bottom: 0;
}

.manage-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.manage-form-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* Card list in deck manage */
.card-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.card-item {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 6px;
}

.card-item-front {
    font-weight: 600;
    font-size: 0.88rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-item-arrow {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.card-item-back {
    font-size: 0.85rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.card-item-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
    margin-left: auto;
}

.card-form {
    margin-bottom: 12px;
}

/* Empty & Loading states */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.loading-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

/* Error message */
.error-msg {
    background: rgba(225, 112, 85, 0.15);
    border: 1px solid var(--error);
    border-radius: var(--radius);
    padding: 8px 12px;
    font-size: 0.82rem;
    color: var(--error);
    margin-bottom: 12px;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 16px;
    font-size: 0.82rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    animation: toastIn 0.2s ease;
}

.toast-error {
    border-color: var(--error);
    color: var(--error);
}

.toast-success {
    border-color: var(--success);
    color: var(--success);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 600px) {
    .deck-grid {
        grid-template-columns: 1fr;
    }

    .study-card {
        padding: 24px 18px;
    }

    .study-card-content {
        font-size: 1.1rem;
    }

    .rating-buttons {
        gap: 6px;
    }

    .btn-rate {
        min-width: 65px;
        padding: 8px 10px;
        font-size: 0.82rem;
    }
}