/* ============================================================
   Paragraph Shuffler Pro – Front-End Styles
   Premium card layout · Responsive · Dark-mode ready
   ============================================================ */

/* ── Google Fonts ──────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=Syne:wght@600;700;800&display=swap');

/* ── CSS Custom Properties (Light Theme) ───────────────────── */
.psp-wrap {
    --psp-bg:           #f7f5ff;
    --psp-card:         #ffffff;
    --psp-border:       #e4deff;
    --psp-text:         #1a1530;
    --psp-text-muted:   #7c6e9a;
    --psp-accent:       #6c5ce7;
    --psp-accent-2:     #a29bfe;
    --psp-accent-grad:  linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%);
    --psp-danger:       #d63031;
    --psp-danger-light: #fff5f5;
    --psp-success:      #00b894;
    --psp-success-light:#f0fff8;
    --psp-error-light:  #fff0f0;
    --psp-shadow:       0 8px 32px rgba(108, 92, 231, .10);
    --psp-shadow-sm:    0 2px 8px  rgba(108, 92, 231, .08);
    --psp-radius:       14px;
    --psp-radius-sm:    8px;
    --psp-font-body:    'DM Sans', system-ui, sans-serif;
    --psp-font-display: 'Syne', system-ui, sans-serif;
    --psp-transition:   0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Dark Theme ─────────────────────────────────────────────── */
.psp-wrap.psp-dark {
    --psp-bg:           #13101f;
    --psp-card:         #1e1a2e;
    --psp-border:       #2e2848;
    --psp-text:         #ece8ff;
    --psp-text-muted:   #8a7fb5;
    --psp-accent:       #a29bfe;
    --psp-accent-2:     #6c5ce7;
    --psp-shadow:       0 8px 32px rgba(0,0,0,.4);
    --psp-shadow-sm:    0 2px 10px rgba(0,0,0,.25);
    --psp-danger-light: #2a1515;
    --psp-success-light:#0d2420;
    --psp-error-light:  #2a1515;
}

/* ── Base Wrapper ───────────────────────────────────────────── */
.psp-wrap {
    font-family: var(--psp-font-body);
    font-size: 15px;
    line-height: 1.6;
    color: var(--psp-text);
    background: var(--psp-bg);
    border-radius: var(--psp-radius);
    padding: 32px;
    box-shadow: var(--psp-shadow);
    max-width: 1100px;
    margin: 0 auto 40px;
    box-sizing: border-box;
    transition: background var(--psp-transition), color var(--psp-transition);
}

*, *::before, *::after { box-sizing: inherit; }

/* ── Header ─────────────────────────────────────────────────── */
.psp-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1.5px solid var(--psp-border);
}

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

.psp-logo-icon {
    font-size: 2.4rem;
    line-height: 1;
    background: var(--psp-accent-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    filter: drop-shadow(0 2px 6px rgba(108,92,231,.3));
}

.psp-title {
    font-family: var(--psp-font-display);
    font-size: 1.55rem;
    font-weight: 800;
    margin: 0 0 2px;
    color: var(--psp-text);
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.3px;
}

.psp-pro-badge {
    font-family: var(--psp-font-body);
    font-size: 0.58em;
    font-weight: 700;
    letter-spacing: 1.5px;
    background: var(--psp-accent-grad);
    color: #fff;
    padding: 3px 10px;
    border-radius: 20px;
    vertical-align: middle;
    text-transform: uppercase;
    line-height: 1;
}

.psp-subtitle {
    margin: 0;
    font-size: 0.9rem;
    color: var(--psp-text-muted);
    font-weight: 400;
}

/* ── Alert Banner ───────────────────────────────────────────── */
.psp-alert {
    padding: 13px 18px;
    border-radius: var(--psp-radius-sm);
    font-size: 0.93rem;
    font-weight: 500;
    margin-bottom: 20px;
    border: 1px solid transparent;
    transition: opacity var(--psp-transition);
}

.psp-alert--success {
    background: var(--psp-success-light);
    color: var(--psp-success);
    border-color: #b2f2e2;
}

.psp-alert--error {
    background: var(--psp-error-light);
    color: var(--psp-danger);
    border-color: #ffcdd2;
}

/* ── Controls Row ───────────────────────────────────────────── */
.psp-controls-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 16px;
    background: var(--psp-card);
    border: 1px solid var(--psp-border);
    border-radius: var(--psp-radius-sm);
    padding: 18px 20px;
    box-shadow: var(--psp-shadow-sm);
}

.psp-advanced-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 22px;
    background: var(--psp-card);
    border: 1px solid var(--psp-border);
    border-radius: var(--psp-radius-sm);
    padding: 16px 20px;
    box-shadow: var(--psp-shadow-sm);
}

.psp-control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 200px;
}

.psp-seed-group,
.psp-exclude-group {
    flex: 1 1 260px;
}

.psp-label {
    font-size: 0.83rem;
    font-weight: 600;
    color: var(--psp-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.7px;
}

.psp-hint {
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.9em;
    color: var(--psp-accent-2);
}

.psp-select,
.psp-input-text {
    background: var(--psp-bg);
    border: 1.5px solid var(--psp-border);
    border-radius: var(--psp-radius-sm);
    color: var(--psp-text);
    font-family: var(--psp-font-body);
    font-size: 0.93rem;
    padding: 8px 12px;
    outline: none;
    transition: border-color var(--psp-transition), box-shadow var(--psp-transition);
    appearance: none;
    -webkit-appearance: none;
}

.psp-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236c5ce7' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
    cursor: pointer;
}

.psp-select:focus,
.psp-input-text:focus {
    border-color: var(--psp-accent);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, .18);
}

.psp-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    align-items: center;
    padding-top: 4px;
}

.psp-checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.91rem;
    color: var(--psp-text);
    user-select: none;
    white-space: nowrap;
}

.psp-checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--psp-accent);
    cursor: pointer;
}

/* ── Two-Panel Layout ───────────────────────────────────────── */
.psp-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 22px;
}

@media (max-width: 680px) {
    .psp-panels { grid-template-columns: 1fr; }
}

.psp-panel {
    background: var(--psp-card);
    border: 1.5px solid var(--psp-border);
    border-radius: var(--psp-radius);
    overflow: hidden;
    box-shadow: var(--psp-shadow-sm);
    transition: box-shadow var(--psp-transition);
    display: flex;
    flex-direction: column;
}

.psp-panel:focus-within {
    box-shadow: 0 0 0 3px rgba(108,92,231,.18), var(--psp-shadow);
    border-color: var(--psp-accent);
}

.psp-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 16px;
    background: linear-gradient(135deg, rgba(108,92,231,.06) 0%, rgba(162,155,254,.06) 100%);
    border-bottom: 1px solid var(--psp-border);
}

.psp-panel-title {
    font-family: var(--psp-font-display);
    font-weight: 700;
    font-size: 0.93rem;
    color: var(--psp-text);
    letter-spacing: -0.1px;
}

.psp-stats {
    font-size: 0.79rem;
    color: var(--psp-text-muted);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.psp-textarea {
    flex: 1;
    width: 100%;
    min-height: 280px;
    background: transparent;
    border: none;
    outline: none;
    resize: vertical;
    padding: 16px;
    font-family: 'DM Mono', 'Fira Mono', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.75;
    color: var(--psp-text);
    caret-color: var(--psp-accent);
}

.psp-textarea::placeholder {
    color: var(--psp-text-muted);
    opacity: 0.6;
}

.psp-paragraph-hint {
    padding: 8px 16px;
    font-size: 0.8rem;
    color: var(--psp-text-muted);
    background: linear-gradient(135deg, rgba(108,92,231,.04) 0%, transparent 100%);
    border-top: 1px solid var(--psp-border);
}

.psp-paragraph-hint strong {
    color: var(--psp-accent);
}

/* ── Action Buttons ─────────────────────────────────────────── */
.psp-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.psp-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 11px 22px;
    border: none;
    border-radius: var(--psp-radius-sm);
    font-family: var(--psp-font-body);
    font-size: 0.91rem;
    font-weight: 600;
    cursor: pointer;
    transition:
        transform var(--psp-transition),
        box-shadow var(--psp-transition),
        filter var(--psp-transition),
        opacity var(--psp-transition);
    white-space: nowrap;
    line-height: 1;
    letter-spacing: 0.1px;
}

.psp-btn:active { transform: translateY(1px); }

.psp-btn:disabled {
    opacity: 0.42;
    cursor: not-allowed;
    filter: grayscale(0.3);
    transform: none !important;
}

/* Primary – gradient shuffle */
.psp-btn-primary {
    background: var(--psp-accent-grad);
    color: #fff;
    box-shadow: 0 4px 18px rgba(108,92,231,.35);
    padding: 13px 28px;
    font-size: 0.97rem;
    letter-spacing: 0.2px;
}

.psp-btn-primary:not(:disabled):hover {
    box-shadow: 0 6px 24px rgba(108,92,231,.55);
    transform: translateY(-2px);
    filter: brightness(1.06);
}

.psp-btn-icon {
    font-size: 1.1em;
    line-height: 1;
}

/* Secondary */
.psp-btn-secondary {
    background: var(--psp-card);
    color: var(--psp-accent);
    border: 1.5px solid var(--psp-border);
    box-shadow: var(--psp-shadow-sm);
}

.psp-btn-secondary:not(:disabled):hover {
    background: rgba(108,92,231,.06);
    border-color: var(--psp-accent);
    transform: translateY(-1px);
}

/* Danger */
.psp-btn-danger {
    background: var(--psp-danger-light);
    color: var(--psp-danger);
    border: 1.5px solid #ffcdd2;
    margin-left: auto;
}

.psp-btn-danger:not(:disabled):hover {
    background: #ffe0e0;
    transform: translateY(-1px);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 800px) {
    .psp-wrap { padding: 20px 16px; }
    .psp-controls-row,
    .psp-advanced-row { flex-direction: column; gap: 14px; }
    .psp-actions { gap: 8px; }
    .psp-btn-danger { margin-left: 0; }
}

@media (max-width: 480px) {
    .psp-title { font-size: 1.25rem; }
    .psp-btn-primary { width: 100%; justify-content: center; }
    .psp-btn { font-size: 0.86rem; padding: 10px 16px; }
}