/**
 * MetaoFly - Tool 13: Offline PDF Password Remover & 256-Bit Encryptor
 * CSS Stylesheet - Strict 2-Column Desktop / 1-Column Mobile Responsive Architecture
 */

/* ── Root Workspace Variables & Container ── */
.pre-workspace {
    --pre-accent: #8b5cf6;
    --pre-accent-glow: rgba(139, 92, 246, 0.25);
    --pre-accent-hover: #7c3aed;
    --pre-bg-dark: #0b0f19;
    --pre-card-bg: rgba(17, 24, 39, 0.75);
    --pre-card-border: rgba(255, 255, 255, 0.08);
    --pre-card-hover-border: rgba(139, 92, 246, 0.35);
    --pre-text-main: #f8fafc;
    --pre-text-muted: #94a3b8;
    --pre-danger: #f43f5e;
    --pre-success: #10b981;
    --pre-radius: 16px;
    --pre-radius-sm: 10px;

    width: 100%;
    box-sizing: border-box;
    font-family: inherit;
    color: var(--pre-text-main);
}

.tool-workspace.pre-workspace {
    grid-template-columns: minmax(0, 480px) minmax(0, 1fr);
}

@media (max-width: 1024px) {
    .tool-workspace.pre-workspace {
        grid-template-columns: 1fr;
    }
}

/* ── Top Header Banner ── */
.pre-header-banner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 24px;
    padding: 24px 28px;
    background: linear-gradient(135deg, rgba(17, 24, 39, 0.8) 0%, rgba(88, 28, 135, 0.15) 100%);
    border: 1px solid var(--pre-card-border);
    border-radius: var(--pre-radius);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.pre-header-left {
    flex: 1;
}

.pre-badge-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(139, 92, 246, 0.15);
    color: #c084fc;
    border: 1px solid rgba(192, 132, 252, 0.3);
    padding: 5px 12px;
    border-radius: 9999px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.pre-studio-title {
    font-size: 1.85rem;
    font-weight: 800;
    line-height: 1.25;
    margin: 0 0 8px 0;
    color: #fff;
    letter-spacing: -0.02em;
}

.pre-title-gradient {
    background: linear-gradient(135deg, #c084fc 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.pre-studio-subtitle {
    font-size: 0.95rem;
    color: var(--pre-text-muted);
    line-height: 1.55;
    margin: 0;
    max-width: 780px;
}

.pre-quick-badges {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pre-pill-stat {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 14px;
    border-radius: 9999px;
    font-size: 0.82rem;
    font-weight: 500;
    color: #cbd5e1;
    white-space: nowrap;
}

.pre-pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    box-shadow: 0 0 10px currentColor;
}

/* ── Upload Stage & Dropzone ── */
.pre-upload-stage {
    margin: 20px 0;
}

.pre-dropzone {
    position: relative;
    padding: 56px 36px;
    text-align: center;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.06) 0%, rgba(15, 23, 42, 0.8) 100%);
    border: 2px dashed rgba(192, 132, 252, 0.35);
    border-radius: var(--pre-radius);
    cursor: pointer;
    transition: all 0.25s ease;
}

.pre-dropzone:hover,
.pre-dropzone.pre-dragover {
    border-color: #8b5cf6;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.12) 0%, rgba(15, 23, 42, 0.9) 100%);
    box-shadow: 0 0 35px rgba(139, 92, 246, 0.25);
    transform: translateY(-2px);
}

.pre-hidden-file-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
    z-index: 5;
}

.pre-drop-icon-wrap {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: rgba(139, 92, 246, 0.12);
    border: 1px solid rgba(192, 132, 252, 0.3);
    color: #c084fc;
    margin-bottom: 20px;
}

.pre-glow-ring {
    position: absolute;
    inset: -6px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(192, 132, 252, 0.4) 0%, transparent 70%);
    animation: prePulse 3s infinite;
}

@keyframes prePulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.pre-drop-title {
    font-size: 1.45rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 10px 0;
}

.pre-drop-desc {
    font-size: 0.95rem;
    color: var(--pre-text-muted);
    max-width: 640px;
    margin: 0 auto 28px auto;
    line-height: 1.6;
}

.pre-drop-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    margin-bottom: 30px;
    position: relative;
    z-index: 6;
}

.pre-btn-browse,
.pre-btn-sample {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pre-btn-browse {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: #fff;
    border: none;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

.pre-btn-browse:hover {
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
    transform: translateY(-1px);
}

.pre-btn-sample {
    background: rgba(255, 255, 255, 0.06);
    color: #e2e8f0;
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.pre-btn-sample:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.pre-drop-features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 24px;
    font-size: 0.85rem;
    color: #cbd5e1;
}

.pre-drop-features span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ══════════════════════════════════════════════════════════
   TOP STUDIO TOOLBAR (Active when PDF loaded)
   ══════════════════════════════════════════════════════════ */
.pre-top-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding: 14px 20px;
    background: rgba(17, 24, 39, 0.7);
    border: 1px solid var(--pre-card-border);
    border-radius: var(--pre-radius);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.pre-file-pill {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #f1f5f9;
}

.pre-pill-meta {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--pre-text-muted);
    padding-left: 10px;
    border-left: 1px solid rgba(255, 255, 255, 0.12);
}

.pre-toolbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pre-btn-small {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: #e2e8f0;
}

.pre-btn-small:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ══════════════════════════════════════════════════════════
   STRICT 2-COLUMN DESKTOP / 1-COLUMN MOBILE GRID
   ══════════════════════════════════════════════════════════ */
.pre-studio-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(380px, 440px);
    gap: 24px;
    align-items: start;
}

/* ── COLUMN 1: VISUAL VERIFICATION & DOCUMENT PREVIEW ── */
.pre-stage-column {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pre-preview-card {
    background: var(--pre-card-bg);
    border: 1px solid var(--pre-card-border);
    border-radius: var(--pre-radius);
    padding: 20px;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.pre-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.pre-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.05);
    padding: 6px 12px;
    border-radius: 8px;
}

.pre-status-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
}

.pre-icon-locked {
    background: rgba(139, 92, 246, 0.2);
    color: #c084fc;
}

.pre-icon-unlocked {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
}

.pre-page-indicator {
    font-size: 0.82rem;
    color: var(--pre-text-muted);
}

.pre-page-indicator strong {
    color: #fff;
}

/* Stage Viewport Area */
.pre-stage-viewport {
    min-height: 480px;
    max-height: 720px;
    overflow: auto;
    background: #060911;
    border: 1px solid var(--pre-card-border);
    border-radius: var(--pre-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
}

.pre-locked-shield {
    text-align: center;
    padding: 40px 20px;
}

.pre-shield-icon-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: rgba(139, 92, 246, 0.12);
    border: 1px solid rgba(192, 132, 252, 0.3);
    margin-bottom: 20px;
}

.pre-shield-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 10px 0;
}

.pre-shield-desc {
    font-size: 0.9rem;
    color: var(--pre-text-muted);
    max-width: 420px;
    margin: 0 auto;
    line-height: 1.5;
}

.pre-canvas-wrapper {
    background: #ffffff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
}

.pre-preview-canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.pre-security-checklist {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pre-check-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: #94a3b8;
}

/* ══════════════════════════════════════════════════════════
   COLUMN 2: CONTROLS & EXPORT PANEL
   ══════════════════════════════════════════════════════════ */
.pre-controls-column {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pre-mode-tabs-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    padding: 6px;
    background: rgba(17, 24, 39, 0.7);
    border: 1px solid var(--pre-card-border);
    border-radius: var(--pre-radius);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.pre-tab-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    background: transparent;
    border: none;
    border-radius: var(--pre-radius-sm);
    color: var(--pre-text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pre-tab-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.04);
}

.pre-tab-btn.active {
    background: rgba(139, 92, 246, 0.15);
    color: #c084fc;
    border: 1px solid rgba(192, 132, 252, 0.3);
}

/* Cards */
.pre-card {
    background: var(--pre-card-bg);
    border: 1px solid var(--pre-card-border);
    border-radius: var(--pre-radius);
    padding: 20px;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
}

.pre-card-header {
    margin-bottom: 16px;
}

.pre-step-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 8px;
    border-radius: 6px;
    margin-bottom: 6px;
}

.pre-tag-purple {
    color: #c084fc;
    background: rgba(139, 92, 246, 0.15);
}

.pre-tag-emerald {
    color: #34d399;
    background: rgba(16, 185, 129, 0.15);
}

.pre-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0;
    color: #fff;
}

/* Inputs & Passwords */
.pre-input-group {
    margin-bottom: 16px;
}

.pre-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: #cbd5e1;
    margin-bottom: 6px;
}

.pre-password-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.pre-text-input {
    width: 100%;
    padding: 10px 40px 10px 14px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--pre-card-border);
    border-radius: 8px;
    color: #fff;
    font-size: 0.95rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.pre-text-input:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.pre-eye-btn {
    position: absolute;
    right: 8px;
    background: transparent;
    border: none;
    color: var(--pre-text-muted);
    cursor: pointer;
    padding: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.pre-eye-btn:hover {
    color: #fff;
}

.pre-btn-verify {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 11px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #fff;
    cursor: pointer;
    margin-bottom: 12px;
    transition: all 0.2s;
}

.pre-btn-verify:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.pre-alert-error {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: rgba(244, 63, 94, 0.1);
    border: 1px solid rgba(244, 63, 94, 0.3);
    border-radius: 8px;
    color: #fda4af;
    font-size: 0.8rem;
    margin-bottom: 14px;
}

.pre-ethical-note {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.78rem;
    color: #94a3b8;
    line-height: 1.45;
    background: rgba(0, 0, 0, 0.25);
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

/* Password Strength Meter */
.pre-strength-meter {
    margin-top: 8px;
}

.pre-strength-bar-bg {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 4px;
}

.pre-strength-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.pre-strength-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--pre-text-muted);
}

/* Permissions Box */
.pre-permissions-box {
    margin-bottom: 20px;
    background: rgba(0, 0, 0, 0.25);
    padding: 14px;
    border-radius: 10px;
    border: 1px solid var(--pre-card-border);
}

.pre-perm-title {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    color: #cbd5e1;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.pre-toggle-perm {
    margin-bottom: 10px;
}

.pre-toggle-perm:last-child {
    margin-bottom: 0;
}

.pre-checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
}

.pre-checkbox-label input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.pre-check-square {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
    margin-top: 2px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.pre-checkbox-label input:checked + .pre-check-square {
    background: #8b5cf6;
    border-color: #8b5cf6;
}

.pre-checkbox-label input:checked + .pre-check-square:after {
    content: "✓";
    color: #fff;
    font-size: 12px;
    font-weight: bold;
}

.pre-perm-desc strong {
    display: block;
    font-size: 0.82rem;
    color: #f1f5f9;
}

.pre-perm-desc span {
    font-size: 0.72rem;
    color: var(--pre-text-muted);
    line-height: 1.35;
}

/* Action Buttons */
.pre-action-wrap {
    margin-top: 8px;
}

.pre-btn-action {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px;
    font-size: 1.05rem;
    font-weight: 700;
    border-radius: 12px;
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: #fff;
    border: none;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
    transition: all 0.2s ease;
}

.pre-btn-action:hover:not(:disabled) {
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.6);
    transform: translateY(-2px);
}

.pre-btn-action:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
}

/* Trust Footer Card */
.pre-trust-footer-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(52, 211, 153, 0.2);
    border-radius: 10px;
    font-size: 0.78rem;
    color: #cbd5e1;
    line-height: 1.45;
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE DESIGN (Strict 1-Column Mobile Layout)
   ══════════════════════════════════════════════════════════ */
@media (max-width: 1023px) {
    .pre-studio-grid {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    .pre-header-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 20px;
    }

    .pre-quick-badges {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .pre-top-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .pre-stage-viewport {
        min-height: 380px;
        max-height: 540px;
    }
}

@media (max-width: 640px) {
    .pre-dropzone {
        padding: 36px 16px;
    }

    .pre-studio-title {
        font-size: 1.45rem;
    }

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

    .pre-btn-browse,
    .pre-btn-sample {
        width: 100%;
        justify-content: center;
    }
}