/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    --bg: #f1f5f9;
    --surface: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

/* ===================================
   Base Typography
   =================================== */
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 15px;
}

h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
}

p {
    margin-bottom: 8px;
    color: var(--text);
}

a {
    color: var(--primary);
}

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

header {
    padding: 24px 0 16px;
    background: none;
    color: var(--text);
}

main {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 20px;
}

/* ===================================
   Cards
   =================================== */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border: 1px solid var(--border);
}

.card-panel {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border: 1px solid var(--border);
    margin-bottom: 16px;
}

/* ===================================
   Form Controls
   =================================== */
label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 4px;
    margin-top: 12px;
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: var(--font);
    font-size: 0.9rem;
    color: var(--text);
    background: var(--surface);
    transition: border-color 0.15s, box-shadow 0.15s, background-color 0.26s;
    margin-bottom: 8px;
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

textarea {
    resize: vertical;
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    line-height: 1.45;
}

input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
    vertical-align: middle;
}

/* ===================================
   Button System
   =================================== */
button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
    text-decoration: none;
    white-space: nowrap;
    background: #475569;
    color: #fff;
    margin-top: 8px;
}

button:hover,
.btn:hover {
    background: #334155;
}

.btn-primary,
.golden-button,
.manage-button {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover,
.golden-button:hover,
.manage-button:hover {
    background: var(--primary-hover);
}

.btn-danger,
.danger-button,
.logout-button {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover,
.danger-button:hover,
.logout-button:hover {
    background: var(--danger-hover);
}

.btn-danger-confirm {
    background: #7f1d1d !important;
    color: #fff;
    animation: pulse-danger 0.3s ease;
}

@keyframes pulse-danger {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.04); }
    100% { transform: scale(1); }
}

/* ===================================
   Front-end Page (index.php)
   =================================== */
.container > header:not(.editor-header) {
    text-align: center;
    padding: 30px 0 10px;
    margin-bottom: 16px;
}

.container > header:not(.editor-header) h1 {
    font-size: 2rem;
    font-weight: 700;
}

.underline {
    height: 3px;
    background: var(--primary);
    width: 80px;
    margin: 10px auto 0;
    border-radius: 2px;
}

.template-section {
    flex: 2;
}

.options-section {
    flex: 1;
}

#text-box {
    width: 100%;
    min-height: 300px;
    margin-bottom: 10px;
}

.golden-button {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    margin-top: 10px;
    border-radius: 8px;
}

.alert {
    display: none;
    margin-top: 10px;
    padding: 8px 12px;
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
    border-radius: 6px;
    font-size: 0.875rem;
    transition: opacity 0.28s;
}

.content-line {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 6px;
    transition: background 0.1s;
}

.content-line:hover {
    background: #f8fafc;
}

.form-check-input {
    flex-shrink: 0;
}

.form-check-label {
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text);
    line-height: 1.4;
    margin: 0;
    font-weight: normal;
}

/* ===================================
   Editor Page (edit.php)
   =================================== */
.editor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}

.editor-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.editor-actions a {
    margin-top: 0;
}

.options-list,
.editor-pane {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
}

.options-list {
    flex: 1;
    min-width: 200px;
}

.editor-pane {
    flex: 2;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0 0 12px;
}

li[data-key] {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin: 4px 0;
    padding: 9px 12px;
    cursor: grab;
    border-left: 3px solid transparent;
    font-size: 0.875rem;
    color: var(--text);
    transition: background 0.1s, border-left-color 0.15s;
    user-select: none;
}

li[data-key]:hover {
    background: #f1f5f9;
}

li[data-key].active {
    background: #eff6ff;
    border-left-color: var(--primary);
    color: var(--primary);
    font-weight: 500;
}

.button-group {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

#save-option {
    background: var(--primary);
    color: #fff;
}

#save-option:hover {
    background: var(--primary-hover);
}

#delete-option {
    background: var(--danger);
    color: #fff;
}

#delete-option:hover {
    background: var(--danger-hover);
}

.CodeMirror {
    height: 280px;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 8px;
    font-size: 13px;
}

/* Inline form for adding new options */
.new-option-form {
    display: none;
    margin-top: 10px;
    padding: 12px;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.new-option-form input[type="text"] {
    margin-bottom: 8px;
}

.new-option-form .form-actions {
    display: flex;
    gap: 8px;
}

.new-option-form .form-actions button {
    margin-top: 0;
    padding: 6px 14px;
    font-size: 0.8rem;
}

#confirm-add-option {
    background: var(--primary);
    color: #fff;
}

#confirm-add-option:hover {
    background: var(--primary-hover);
}

#cancel-add-option {
    background: #e2e8f0;
    color: var(--text);
}

#cancel-add-option:hover {
    background: #cbd5e1;
}

/* Login page */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--bg);
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: 0 4px 24px rgba(0,0,0,0.1);
    padding: 32px;
    border: 1px solid var(--border);
}

.login-card h1 {
    margin-bottom: 6px;
    font-size: 1.5rem;
}

.login-card p {
    margin-bottom: 20px;
    color: var(--text-muted);
}

.login-card button[type="submit"] {
    width: 100%;
    background: var(--primary);
    color: #fff;
    padding: 10px;
    font-size: 0.95rem;
    border-radius: 6px;
    margin-top: 4px;
}

.login-card button[type="submit"]:hover {
    background: var(--primary-hover);
}

.login-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fca5a5;
    border-radius: 6px;
    padding: 10px 12px;
    margin-bottom: 14px;
    font-size: 0.875rem;
}

/* ===================================
   Import/Export Page (total.php)
   =================================== */
.total-wrap {
    max-width: 1100px;
}

.total-main {
    display: block;
    margin-top: 0;
}

.total-textarea {
    width: 100%;
    min-height: 420px;
    resize: vertical;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: Menlo, Consolas, monospace;
    font-size: 13px;
    line-height: 1.45;
    color: var(--text);
    margin-bottom: 0;
}

.total-controls {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.total-controls button,
.total-controls a {
    margin-top: 0;
}

.confirm-line {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    font-size: 0.875rem;
    cursor: pointer;
    margin-top: 0;
    font-weight: normal;
}

.confirm-line input[type="checkbox"] {
    margin: 0;
}

.warning-text {
    color: var(--danger);
    font-weight: 500;
}

.success-box {
    background: #f0fdf4;
    border: 1px solid #86efac;
    color: #166534;
    border-radius: 6px;
    padding: 10px 14px;
    margin-bottom: 14px;
    font-size: 0.875rem;
}

.error-box {
    background: #fef2f2;
    border: 1px solid #fca5a5;
    color: #991b1b;
    border-radius: 6px;
    padding: 10px 14px;
    margin-bottom: 14px;
    font-size: 0.875rem;
}

/* ===================================
   AI Text Optimization Page (ai.php)
   =================================== */
.ai-prompt-box {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
    margin-top: 14px;
}

.ai-prompt-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.ai-prompt-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
}

.ai-prompt-header button {
    margin-top: 0;
    padding: 5px 12px;
    font-size: 0.8rem;
}

.ai-prompt-textarea {
    min-height: 140px;
    background: var(--surface);
    font-family: var(--font);
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

code {
    font-family: Menlo, Consolas, monospace;
    font-size: 0.85em;
    background: #f1f5f9;
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--text);
}

/* ===================================
   Toast System
   =================================== */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-family: var(--font);
    color: #fff;
    background: #334155;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.25s, transform 0.25s;
    pointer-events: auto;
    max-width: 320px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast-success {
    background: #166534;
}

.toast-error {
    background: #991b1b;
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
    main {
        flex-direction: column;
    }

    .template-section,
    .options-section,
    .options-list,
    .editor-pane {
        flex: auto;
        width: 100%;
    }

    .editor-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .button-group {
        flex-direction: column;
    }

    #toast-container {
        bottom: 12px;
        right: 12px;
        left: 12px;
    }

    .toast {
        max-width: 100%;
    }
}