/* ============================================================
   PDF Editor — Studio CSS (studio.css)
   Acrobat / Figma-grade Interactive PDF Studio Layout & Styles
   ============================================================ */

/* ── Studio Root Layout ──────────────────────────────────── */
.studio-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    background: var(--bg-primary);
    color: var(--text-primary);
    position: relative;
}

/* ── Top App Bar / Header ────────────────────────────────── */
.studio-header {
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    z-index: var(--z-sticky);
    backdrop-filter: blur(16px);
}

.studio-header__left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 220px;
}

.studio-header__center {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.studio-header__right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 220px;
    justify-content: flex-end;
}

.studio-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: var(--weight-bold);
    font-size: var(--text-base);
}

.studio-logo__badge {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-md);
    background: var(--accent-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.studio-doc-title {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.studio-doc-title:hover,
.studio-doc-title:focus {
    border-color: var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
}

/* ── Mode Switcher Pills ─────────────────────────────────── */
.mode-tabs {
    display: flex;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    padding: 3px;
    gap: 2px;
}

.mode-tab {
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--duration-fast);
}

.mode-tab:hover {
    color: var(--text-primary);
}

.mode-tab.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 2px 8px var(--accent-glow);
}

/* ── Floating Tool Bar ───────────────────────────────────── */
.studio-toolbar {
    height: 48px;
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    backdrop-filter: blur(12px);
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-btn {
    height: 34px;
    padding: 0 10px;
    border-radius: var(--radius-md);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: all var(--duration-fast);
}

.tool-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border);
    color: var(--text-primary);
}

.tool-btn.active {
    background: var(--accent-soft);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.tool-separator {
    width: 1px;
    height: 20px;
    background: var(--divider);
    margin: 0 4px;
}

/* ── Studio Body (Sidebar + Viewport + Properties) ────────── */
.studio-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* ── Left Sidebar (Thumbnails / Tools) ────────────────────── */
.studio-sidebar {
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    transition: width var(--duration-normal) var(--ease-out-expo);
    z-index: 10;
}

.studio-sidebar.collapsed {
    width: 0;
    overflow: hidden;
    border-right: none;
}

.sidebar-header {
    height: 40px;
    padding: 0 var(--space-3);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--divider);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    color: var(--text-secondary);
}

.sidebar-thumbnails-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.thumb-card {
    position: relative;
    background: var(--bg-primary);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-2);
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all var(--duration-fast);
}

.thumb-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.thumb-card.active {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
}

.thumb-card__canvas {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    background: white;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.thumb-card__footer {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 4px;
    font-size: 11px;
    color: var(--text-tertiary);
}

/* ── Center Viewport (The Document Canvas) ────────────────── */
.studio-viewport {
    flex: 1;
    background: var(--bg-primary);
    overflow: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-8);
    gap: var(--space-8);
    position: relative;
    scroll-behavior: smooth;
}

.page-container {
    position: relative;
    background: #ffffff;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25), 0 2px 8px rgba(0, 0, 0, 0.15);
    border-radius: 4px;
    overflow: hidden;
    transform-origin: top center;
    transition: transform var(--duration-fast);
}

.page-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Interactive Annotation Canvas Overlay */
.annotation-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

.annotation-canvas.active-mode {
    pointer-events: auto;
    cursor: crosshair;
}

/* Text Element Box Overlay */
.text-annotation-box {
    position: absolute;
    border: 1px dashed var(--accent-primary);
    background: rgba(255, 255, 255, 0.9);
    color: #000000;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: move;
    font-family: inherit;
    font-size: 16px;
    outline: none;
    min-width: 80px;
    z-index: 6;
    user-select: text;
}

/* Signature Element Stamp */
.signature-stamp {
    position: absolute;
    cursor: move;
    border: 1px dashed var(--accent-primary);
    padding: 4px;
    border-radius: 4px;
    z-index: 6;
}

/* ── Bottom Floating Zoom Controls ───────────────────────── */
.floating-controls {
    position: absolute;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    padding: 4px 12px;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(16px);
    z-index: 20;
}

.zoom-indicator {
    font-size: var(--text-xs);
    font-family: var(--font-mono);
    color: var(--text-secondary);
    min-width: 48px;
    text-align: center;
}

/* ── Modal (Signature & Options) ─────────────────────────── */
.signature-pad-container {
    background: #ffffff;
    border-radius: var(--radius-lg);
    border: 2px dashed #cccccc;
    position: relative;
    width: 100%;
    height: 180px;
    margin: var(--space-4) 0;
    overflow: hidden;
}

#signaturePadCanvas {
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

/* ── Empty State / Initial Dropzone in Studio ─────────────── */
.studio-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    padding: var(--space-8);
}