/*
   PDF TOOLS - EXPERT WEB TOOLS
*/

@font-face { font-family: 'Inter';       src: url('/fonts/inter-v20-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Orbitron';    src: url('/fonts/orbitron-v35-latin-700.woff2')  format('woff2'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'Roboto Mono'; src: url('/fonts/roboto-mono-v31-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }

/* Theme Variables (Default Dark) */
:root {
    --bg-main:          #0a0a0f;
    --primary-accent:   #3b82f6;
    --secondary-accent: #8b5cf6;
    --text-main:        #ffffff;
    --text-muted:       #94a3b8;
    --card-bg:          rgba(25, 25, 35, 0.6);
    --card-border:      rgba(255, 255, 255, 0.08);
    --input-bg:         rgba(255, 255, 255, 0.05);
    --hover-bg:         rgba(255, 255, 255, 0.05);
    --active-bg:        rgba(59, 130, 246, 0.1);
    --font-heading:     'Orbitron', sans-serif;
    --font-body:        'Inter', sans-serif;
    --font-code:        'Roboto Mono', monospace;
}

/* Light Theme Overrides (Standardized) */
html.light-theme {
    --bg-main:          #f8fafc;
    --primary-accent:   #2563eb;
    --secondary-accent: #7c3aed;
    --text-main:        #0f172a;
    --text-muted:       #475569;
    --card-bg:          rgba(255, 255, 255, 0.9);
    --card-border:      rgba(0, 0, 0, 0.1);
    --input-bg:         #ffffff;
    --hover-bg:         rgba(0, 0, 0, 0.03);
    --active-bg:        rgba(37, 99, 235, 0.1);
}

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

/* FIX: Removed overflow-x: hidden to restore accessibility and prevent layout masking */
html, body { 
    width: 100%; 
    max-width: 100%; 
    transition: background-color 0.2s ease; 
}

body { 
    background-color: var(--bg-main); 
    color: var(--text-main); 
    font-family: var(--font-body); 
    min-height: 100vh; 
    display: flex; 
    flex-direction: column; 
}

/* Accessibility Utilities */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }

.background-glow {
    position: fixed; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at center, rgba(59,130,246,0.05) 0%, transparent 50%);
    z-index: -1; pointer-events: none;
}
html.light-theme .background-glow { opacity: 0.5; }

/* Header */
.tool-header { display: flex; justify-content: space-between; align-items: center; padding: 1.5rem 5%; max-width: 1400px; margin: 0 auto; width: 100%; }
.back-btn { color: var(--text-muted); text-decoration: none; display: flex; align-items: center; gap: 8px; transition: color 0.3s; border-radius: 4px; padding: 2px 4px; }
.back-btn:hover { color: var(--primary-accent); }
.back-btn:focus-visible { outline: 2px solid var(--primary-accent); color: var(--primary-accent); }

.header-right { display: flex; align-items: center; gap: 15px; }
.logo { font-family: var(--font-heading); font-size: 1.2rem; }
.logo span { color: var(--primary-accent); }

/* Theme Toggle Button (Standardized) */
.theme-toggle-btn {
    background: none; border: none; color: var(--text-muted); cursor: pointer;
    font-size: 1.25rem; transition: color 0.2s; padding: 6px;
    display: flex; align-items: center; justify-content: center;
}
.theme-toggle-btn:hover { color: var(--primary-accent); }
.theme-toggle-btn:focus-visible { outline: 2px solid var(--primary-accent); border-radius: 4px; }

/* Main Layout */
.tool-intro { text-align: center; margin-bottom: 2rem; padding: 0 5%; }
.tool-intro h1 { font-family: var(--font-heading); font-size: 2rem; margin-bottom: 0.5rem; }
.tool-intro p  { color: var(--text-muted); }
.main-content { flex-grow: 1; padding: 2rem 5%; max-width: 1200px; margin: 0 auto; width: 100%; }
.tool-layout { display: grid; grid-template-columns: 250px 1fr; gap: 2rem; align-items: start; width: 100%; }

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 2rem; width: 100%; }
.nav-grid { display: flex; flex-direction: column; gap: 5px; }
.nav-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin: 15px 0 5px 10px; }
.nav-btn {
    background: transparent; border: 1px solid transparent; color: var(--text-muted);
    padding: 12px 15px; border-radius: 8px; cursor: pointer; text-align: left;
    font-size: 0.95rem; font-family: var(--font-body); transition: all 0.2s;
    display: flex; align-items: center; gap: 10px; width: 100%;
}
.nav-btn i { width: 20px; text-align: center; }
.nav-btn:hover { background: var(--hover-bg); color: var(--text-main); }
.nav-btn.active { background: var(--active-bg); border-color: rgba(59,130,246,0.3); color: var(--primary-accent); font-weight: 600; }
.nav-btn:focus-visible { outline: 2px solid var(--primary-accent); outline-offset: 2px; }

/* Tool Display */
.tool-display { min-height: 400px; width: 100%; }
.tool-pane { display: none; flex-direction: column; gap: 1.5rem; animation: fadeIn 0.3s ease; width: 100%; }
.tool-pane.active { display: flex; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.pane-header h2 { font-family: var(--font-heading); font-size: 1.5rem; margin-bottom: 5px; line-height: 1.3; outline: none; }
.pane-header p  { color: var(--text-muted); font-size: 0.9rem; }

/* Drop Zone */
.drop-area {
    background: var(--card-bg); border: 2px dashed var(--card-border); border-radius: 16px;
    padding: 3rem 1rem; text-align: center; cursor: pointer; transition: all 0.2s; width: 100%;
}
.drop-area:hover, .drop-area.dragover { border-color: var(--primary-accent); background: var(--active-bg); }
.drop-area:focus-visible { outline: 2px solid var(--primary-accent); outline-offset: 4px; border-color: var(--primary-accent); }
.upload-icon { font-size: 3rem; color: var(--secondary-accent); margin-bottom: 1rem; display: block; }
.drop-area h3 { font-family: var(--font-heading); font-size: 1.2rem; margin-bottom: 0.5rem; }

/* Settings */
.settings-box { background: var(--card-bg); border: 1px solid var(--card-border); padding: 1.5rem; border-radius: 12px; width: 100%; }
.settings-box label { display: block; margin-bottom: 8px; color: var(--text-muted); font-size: 0.9rem; }
.settings-box input[type="text"], .settings-box input[type="password"] {
    width: 100%; background: var(--input-bg); border: 1px solid var(--card-border);
    color: var(--text-main); padding: 10px; border-radius: 6px; outline: none;
    font-family: var(--font-body); font-size: 16px; /* 16px prevents iOS auto-zoom */
    transition: border-color 0.2s;
}
.settings-box input:focus { border-color: var(--primary-accent); }
.form-group + .form-group { margin-top: 15px; }
.hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 5px; }

/* Rotate Grid */
.rotate-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.rotate-opt {
    background: var(--input-bg); border: 1px solid var(--card-border); color: var(--text-muted);
    padding: 12px; border-radius: 8px; cursor: pointer; display: flex; flex-direction: column;
    align-items: center; gap: 5px; font-family: var(--font-body); font-size: 0.9rem;
}
.rotate-opt:hover { color: var(--text-main); border-color: var(--primary-accent); }
.rotate-opt.selected { background: var(--primary-accent); color: #fff; border-color: var(--primary-accent); }
.rotate-opt:focus-visible { outline: 2px solid var(--primary-accent); outline-offset: 2px; }

/* File List */
.file-list { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.file-list-item {
    background: var(--card-bg); border: 1px solid var(--card-border); padding: 12px 15px;
    border-radius: 8px; display: flex; justify-content: space-between; align-items: center; min-width: 0;
}
.file-list-item.draggable { user-select: none; -webkit-user-select: none; }
.file-list-item.dragging { opacity: 0.5; background: var(--active-bg); }

/* Drag Handle specifically styled for grabbing */
.drag-handle { color: var(--text-muted); flex-shrink: 0; padding: 4px; cursor: grab; touch-action: none; }
.drag-handle:active { cursor: grabbing; }

.file-name {
    color: var(--text-main); font-size: 0.9rem; display: flex; align-items: center; gap: 10px;
    overflow: hidden; pointer-events: none; min-width: 0; flex-grow: 1;
}
.file-name span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; display: block; }
.file-name .fa-file-pdf { color: #ef4444; flex-shrink: 0; }
.file-name .fa-image { color: #8b5cf6; flex-shrink: 0; }
.remove-file-btn {
    background: transparent; border: none; color: var(--text-muted); cursor: pointer;
    font-size: 1.2rem; padding: 4px 8px; border-radius: 4px; flex-shrink: 0; font-family: var(--font-body);
}
.remove-file-btn:hover { color: #ef4444; }

/* Buttons & Status */
.primary-btn {
    width: 100%; background: var(--primary-accent); color: #fff; border: none; padding: 14px;
    border-radius: 8px; font-weight: 600; cursor: pointer; font-size: 1rem; margin-top: 1rem;
}
.primary-btn:hover:not(:disabled) { background: #2563eb; }
.primary-btn:disabled { background: #475569; cursor: not-allowed; opacity: 0.7; }
.status-box { text-align: center; min-height: 20px; font-size: 0.9rem; color: var(--text-muted); margin-top: 10px; }
.spinner { width: 24px; height: 24px; border: 3px solid rgba(148,163,184,0.2); border-top-color: var(--primary-accent); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 10px auto; }
@keyframes spin { to { transform: rotate(360deg); } }
.download-link { display: inline-block; margin-top: 10px; background: #10b981; color: #fff; padding: 8px 16px; border-radius: 6px; text-decoration: none; font-weight: 600; }
.download-link:hover { background: #059669; }

/* Info Section & FAQ */
.info-section { margin-top: 4rem; display: flex; justify-content: center; padding: 0 10px; }
.info-card { background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.2); padding: 1.5rem; border-radius: 12px; display: flex; gap: 15px; color: var(--text-main); max-width: 700px; width: 100%; }
.info-card > i { font-size: 1.5rem; color: #10b981; margin-top: 3px; }
.info-card h3 { margin-bottom: 5px; font-family: var(--font-heading); font-size: 1rem; }

.faq-section { margin-top: 4rem; padding: 2rem; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; }
.faq-section h2 { font-family: var(--font-heading); font-size: 1.5rem; margin-bottom: 1.5rem; text-align: center; }
.faq-grid { display: flex; flex-direction: column; gap: 1rem; }
.faq-item { border: 1px solid var(--card-border); border-radius: 8px; overflow: hidden; }
.faq-item summary { padding: 1rem; font-weight: 600; cursor: pointer; background: var(--hover-bg); list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '\f078'; font-family: 'Font Awesome 6 Free'; font-weight: 900; color: var(--primary-accent); transition: transform 0.3s; }
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-content { padding: 1rem; color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; border-top: 1px solid var(--card-border); }

/* Toast */
.toast {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    background: #1e1e24; border: 1px solid var(--primary-accent); color: #fff;
    padding: 10px 20px; border-radius: 8px; z-index: 2000; box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    font-size: 0.9rem; white-space: normal; text-align: center;
    max-width: 90vw; width: max-content; opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.toast.toast-visible { opacity: 1; }
.hidden { display: none !important; }
html.light-theme .toast { background: #ffffff; color: #0f172a; border-color: var(--primary-accent); }

footer { text-align: center; padding: 3rem 0; color: var(--text-muted); font-size: 0.9rem; border-top: 1px solid var(--card-border); margin-top: 3rem; }
footer a { color: var(--text-main); text-decoration: none; }

/* Responsive */
@media (max-width: 1024px) {
    .tool-layout { display: flex; flex-direction: column; gap: 1.5rem; }
    .nav-label { display: none; }
    .nav-grid { flex-direction: row; flex-wrap: wrap; gap: 8px; }
    .nav-btn { flex: 1 1 calc(33% - 8px); justify-content: center; background: var(--card-bg); border: 1px solid var(--card-border); }
}

/* FIX: Mobile Header back-button correctly aligns top-left */
@media (max-width: 600px) {
    .tool-header { padding: 1rem; display: flex; flex-direction: row; justify-content: space-between; align-items: center; }
    .header-right { position: static; display: flex; align-items: center; gap: 10px; }
    .main-content { padding: 1rem; }
    .nav-btn { flex: 1 1 calc(50% - 8px); font-size: 0.85rem; padding: 12px 8px; }
    .drop-area { padding: 2rem 1rem; }
    .info-card { flex-direction: column; text-align: center; align-items: center; }
    .faq-section { padding: 1rem; }
}

@media (max-width: 480px) {
    .tool-intro h1 { font-size: 1.5rem; }
    .rotate-grid { grid-template-columns: repeat(2, 1fr); }
}