/* DocConverter Pro — assets/css/app.css */
:root {
    --bg: #0f1117;
    --bg2: #1a1d27;
    --bg3: #22263a;
    --border: #2d3148;
    --text: #e8eaf6;
    --text2: #9ba0c0;
    --accent: #2563eb;
    --accent2: #3b82f6;
    --word: #2563eb;
    --excel: #16a34a;
    --ppt: #ea580c;
    --pdf: #ef4444;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --radius: 14px;
    --shadow: 0 8px 32px rgba(0,0,0,.4);
    --transition: .22s cubic-bezier(.4,0,.2,1);
}
[data-theme="light"] {
    --bg: #f8fafc;
    --bg2: #ffffff;
    --bg3: #f1f5f9;
    --border: #e2e8f0;
    --text: #1e293b;
    --text2: #64748b;
    --shadow: 0 8px 32px rgba(37,99,235,.12);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* ── TOP NAV BAR ── */
.top-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.btn-top-nav {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: 10px;
    background: var(--bg2);
    border: 1px solid var(--border);
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-top-nav:hover {
    background: var(--bg3);
    border-color: var(--accent2);
    color: #fff;
    transform: translateY(-2px);
}

.btn-top-nav-primary {
    background: rgba(37, 99, 235, 0.15);
    border-color: rgba(37, 99, 235, 0.35);
    color: var(--accent2);
}

.btn-top-nav-primary:hover {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.4);
}

/* ── HEADER ── */
.app-header {
    display: flex; align-items: center; gap: 24px;
    padding: 0 32px; height: 64px;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    margin-top: 12px;
    position: sticky; top: 0; z-index: 100;
    backdrop-filter: blur(12px);
}
.header-brand { display: flex; align-items: center; gap: 12px; }
.brand-icon {
    width: 40px; height: 40px; border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; color: #fff;
}
.brand-name { font-size: 18px; font-weight: 700; display: block; }
.brand-pro { color: var(--accent2); }
.brand-tagline { font-size: 11px; color: var(--text2); display: block; }
.header-nav { display: flex; gap: 6px; margin-left: 24px; flex: 1; }
.nav-link {
    padding: 8px 16px; border-radius: 8px;
    background: transparent; border: none;
    color: var(--text2); text-decoration: none; font-size: 14px; font-weight: 500;
    transition: var(--transition); cursor: pointer;
    display: flex; align-items: center; gap: 6px;
}
.nav-link:hover, .nav-link.active { background: var(--bg3); color: var(--text); }
.header-actions { margin-left: auto; }
.btn-theme-toggle {
    width: 36px; height: 36px; border-radius: 8px;
    background: var(--bg3); border: 1px solid var(--border);
    color: var(--text2); cursor: pointer; font-size: 15px;
    transition: var(--transition);
}
.btn-theme-toggle:hover { color: var(--accent2); border-color: var(--accent2); }

/* ── HERO ── */
.hero-section {
    text-align: center;
    padding: 48px 24px 32px;
    max-width: 900px;
    margin: 0 auto;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 14px; border-radius: 20px;
    background: rgba(37,99,235,.12); color: var(--accent2);
    border: 1px solid rgba(37,99,235,.25);
    font-size: 13px; font-weight: 600; margin-bottom: 16px;
}
.hero-title { font-size: 36px; font-weight: 800; line-height: 1.25; margin-bottom: 12px; }
.gradient-text {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle { color: var(--text2); font-size: 16px; }

/* ── MAIN CONTENT ── */
.main-content { max-width: 1100px; margin: 0 auto; padding: 0 24px 60px; }

/* ── TABS ── */
.tab-bar {
    display: flex; gap: 8px; justify-content: center;
    margin-bottom: 32px; flex-wrap: wrap;
}
.tab-btn {
    padding: 12px 24px; border-radius: var(--radius);
    background: var(--bg2); border: 1px solid var(--border);
    color: var(--text2); font-size: 15px; font-weight: 600;
    cursor: pointer; transition: var(--transition);
    display: flex; align-items: center; gap: 8px;
}
.tab-btn:hover { background: var(--bg3); color: var(--text); border-color: var(--border); }
.tab-btn.active {
    background: linear-gradient(135deg, rgba(37,99,235,.2), rgba(59,130,246,.1));
    color: var(--accent2); border-color: rgba(37,99,235,.4);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn .25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ── PANEL GRID ── */
.panel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.panel-box {
    background: var(--bg2); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 32px;
}
.section-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.section-desc { color: var(--text2); font-size: 14px; margin-bottom: 24px; }

/* ── UPLOAD ZONE ── */
.upload-zone {
    border: 2px dashed var(--border); border-radius: var(--radius);
    padding: 40px 24px; text-align: center; cursor: pointer;
    background: var(--bg2); transition: var(--transition);
}
.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--accent2); background: rgba(37,99,235,.05);
}
.upload-icon { font-size: 42px; color: var(--accent2); margin-bottom: 12px; }
.upload-title { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.upload-sub { font-size: 13px; color: var(--text2); margin-bottom: 12px; }
.upload-formats { font-size: 11px; color: var(--text2); margin-bottom: 18px; letter-spacing: 0.5px; }
.file-input { display: none; }
.btn-upload {
    padding: 10px 20px; border-radius: 8px;
    background: var(--bg3); border: 1px solid var(--border);
    color: var(--text); font-size: 14px; font-weight: 600;
    cursor: pointer; transition: var(--transition);
    display: inline-flex; align-items: center; gap: 8px;
}
.btn-upload:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── FILE INFO CARD ── */
.file-info-card {
    display: flex; align-items: center; gap: 14px;
    background: var(--bg2); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 16px 20px; margin-top: 16px;
}
.file-info-icon { font-size: 24px; flex-shrink: 0; }
.file-info-data { flex: 1; min-width: 0; }
.file-info-name { font-weight: 600; font-size: 14px; word-break: break-all; margin-bottom: 2px; }
.file-info-size { font-size: 12px; color: var(--text2); }
.btn-remove {
    background: transparent; border: none; color: var(--text2);
    cursor: pointer; font-size: 16px; padding: 4px 8px; border-radius: 6px;
}
.btn-remove:hover { color: var(--error); background: rgba(239,68,68,.1); }

/* ── CONVERT OPTIONS ── */
.convert-options {
    background: var(--bg2); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px; height: 100%;
    display: flex; flex-direction: column;
}
.options-title { font-size: 16px; font-weight: 700; margin-bottom: 18px; display: flex; align-items: center; gap: 8px; }
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text2); margin-bottom: 8px; }
.form-control {
    width: 100%; padding: 10px 14px; border-radius: 8px;
    background: var(--bg3); border: 1px solid var(--border);
    color: var(--text); font-size: 14px; font-family: inherit;
    outline: none; transition: var(--transition);
}
.form-control:focus { border-color: var(--accent2); box-shadow: 0 0 0 3px rgba(37,99,235,.2); }
.help-text { font-size: 12px; color: var(--text2); margin-top: 6px; display: block; }

/* ── FORMAT GRID ── */
.format-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.format-card {
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    padding: 14px 8px; border-radius: 10px;
    background: var(--bg3); border: 1px solid var(--border);
    cursor: pointer; transition: var(--transition); font-size: 13px; font-weight: 600;
}
.format-card i { font-size: 20px; }
.format-card:hover { border-color: var(--accent2); transform: translateY(-2px); }
.format-card.active {
    background: rgba(37,99,235,.2); border-color: var(--accent2); color: var(--accent2);
}
.empty-hint { grid-column: span 3; font-size: 13px; color: var(--text2); text-align: center; padding: 20px 0; }

/* ── ACTION BUTTONS ── */
.btn-action {
    width: 100%; padding: 14px; border-radius: 10px;
    background: var(--accent); border: none; color: #fff;
    font-size: 15px; font-weight: 700; cursor: pointer;
    transition: var(--transition); display: flex; align-items: center; justify-content: center; gap: 8px;
    margin-top: auto;
}
.btn-action:hover:not(:disabled) {
    background: var(--accent2); box-shadow: 0 4px 16px rgba(37,99,235,.4); transform: translateY(-1px);
}
.btn-action:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── MERGE ITEMS ── */
.merge-file-list { margin-top: 24px; }
.sub-title { font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.merge-items-container { display: flex; flex-direction: column; gap: 8px; }
.merge-item {
    display: flex; align-items: center; gap: 12px;
    background: var(--bg3); border: 1px solid var(--border);
    padding: 12px 16px; border-radius: 10px; font-size: 14px;
}
.merge-num {
    width: 24px; height: 24px; border-radius: 50%;
    background: var(--bg2); border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 700; color: var(--text2);
}
.merge-name { font-weight: 600; flex: 1; word-break: break-all; }
.merge-size { font-size: 12px; color: var(--text2); }
.btn-remove-sm {
    background: transparent; border: none; color: var(--text2);
    cursor: pointer; padding: 4px 8px; border-radius: 4px;
}
.btn-remove-sm:hover { color: var(--error); background: rgba(239,68,68,.1); }

/* ── RESULT CARD ── */
.result-card {
    background: linear-gradient(135deg, rgba(34,197,94,.1), rgba(37,99,235,.1));
    border: 1px solid rgba(34,197,94,.3); border-radius: var(--radius);
    padding: 28px; margin-top: 32px; display: flex; align-items: center; gap: 20px;
}
.result-icon { font-size: 40px; color: var(--success); }
.result-body { flex: 1; }
.result-title { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.result-filename { font-size: 14px; color: var(--text2); margin-bottom: 16px; word-break: break-all; }
.result-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-download {
    padding: 10px 20px; border-radius: 8px;
    background: var(--success); color: #fff; text-decoration: none;
    font-size: 14px; font-weight: 700; display: inline-flex; align-items: center; gap: 8px;
    transition: var(--transition);
}
.btn-download:hover { background: #16a34a; box-shadow: 0 4px 12px rgba(34,197,94,.4); }
.btn-secondary {
    padding: 10px 18px; border-radius: 8px;
    background: var(--bg2); border: 1px solid var(--border);
    color: var(--text); font-size: 14px; font-weight: 600; cursor: pointer;
}

/* ── FINISH USE CARD ── */
.finish-use-card {
    margin-top: 48px;
    padding: 28px;
    background: var(--bg2);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    text-align: center;
}
.finish-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 18px;
}
.finish-buttons {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}
.btn-finish {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}
.btn-finish-back {
    background: var(--bg3);
    border: 1px solid var(--border);
    color: var(--text);
}
.btn-finish-back:hover {
    background: var(--border);
    color: #fff;
}
.btn-finish-home {
    background: rgba(37,99,235,.15);
    border: 1px solid rgba(37,99,235,.35);
    color: var(--accent2);
}
.btn-finish-home:hover {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 16px rgba(37,99,235,.4);
}

/* ── OVERLAY DE CARGA ── */
.loading-overlay {
    position: fixed; inset: 0; background: rgba(15,17,23,.85);
    backdrop-filter: blur(8px); z-index: 1000;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px;
}
.spinner {
    width: 44px; height: 44px; border: 4px solid var(--border);
    border-top-color: var(--accent2); border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 16px; font-weight: 600; color: var(--text); }

/* ── TOAST ── */
.toast {
    position: fixed; bottom: 24px; right: 24px;
    padding: 14px 22px; border-radius: 10px;
    background: var(--bg2); border: 1px solid var(--border);
    color: var(--text); font-size: 14px; font-weight: 600;
    box-shadow: var(--shadow); opacity: 0; transform: translateY(20px);
    transition: var(--transition); pointer-events: none; z-index: 2000;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--error); color: var(--error); }
.toast.info { border-color: var(--accent2); color: var(--accent2); }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
    .panel-grid { grid-template-columns: 1fr; }
    .hero-title { font-size: 26px; }
    .app-header { padding: 0 16px; }
    .header-nav { display: none; }
    .top-nav-container { flex-direction: column; align-items: stretch; }
}