/* 
 * Convert Pro — style.css
 * Premium Design System · 4U.IA.BR
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ─── Reset & Base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --brand:        #7c3aed;
    --brand-light:  #a78bfa;
    --brand-dark:   #4c1d95;
    --accent:       #06b6d4;
    --success:      #10b981;
    --danger:       #f43f5e;
    --bg-deep:      #0c0920;
    --bg-mid:       #110d2e;
    --glass-1:      rgba(255,255,255,0.07);
    --glass-2:      rgba(255,255,255,0.12);
    --border-faint: rgba(255,255,255,0.12);
    --border-glow:  rgba(124,58,237,0.5);
    --text-dim:     rgba(255,255,255,0.45);
    --text-mid:     rgba(255,255,255,0.70);
    --radius-sm:    10px;
    --radius-md:    16px;
    --radius-lg:    24px;
    --radius-xl:    32px;
    --shadow-brand: 0 0 40px rgba(124,58,237,0.25);
    --shadow-card:  0 20px 60px -12px rgba(0,0,0,0.6);
    --transition:   all 0.25s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-deep);
    color: #fff;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ─── Animated Background ───────────────────────────── */
.bg-canvas {
    position: fixed; inset: 0; z-index: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% -10%, rgba(124,58,237,0.28) 0%, transparent 55%),
        radial-gradient(ellipse 60% 40% at 80% 110%, rgba(6,182,212,0.15) 0%, transparent 55%),
        linear-gradient(180deg, #0c0920 0%, #0f0c28 50%, #0c0920 100%);
}

.bg-grid {
    position: fixed; inset: 0; z-index: 0;
    background-image:
        linear-gradient(rgba(124,58,237,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(124,58,237,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 0%, black 30%, transparent 100%);
}

#app { position: relative; z-index: 1; }

/* ─── Header ────────────────────────────────────────── */
.site-header {
    position: sticky; top: 0; z-index: 100;
    padding: 18px 0;
    background: rgba(8,6,26,0.7);
    backdrop-filter: blur(20px) saturate(1.5);
    border-bottom: 1px solid var(--border-faint);
}

.logo-mark {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
    box-shadow: 0 0 20px rgba(124,58,237,0.5), 0 4px 12px rgba(0,0,0,0.4);
    flex-shrink: 0;
}

.pwa-badge {
    display: flex; align-items: center; gap: 6px;
    padding: 6px 12px;
    background: rgba(16,185,129,0.10);
    border: 1px solid rgba(16,185,129,0.25);
    border-radius: 100px;
    font-size: 10px; font-weight: 700;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: #6ee7b7;
    cursor: pointer;
    transition: var(--transition);
}
.pwa-badge:hover {
    background: rgba(16,185,129,0.18);
    border-color: rgba(16,185,129,0.5);
}
.pwa-badge .dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
    animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
    0%,100% { opacity:1; transform: scale(1); }
    50% { opacity:0.6; transform: scale(0.8); }
}

/* ─── Hero Section ──────────────────────────────────── */
.hero-section {
    padding: 60px 0 40px;
    text-align: center;
}

.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px;
    background: rgba(124,58,237,0.12);
    border: 1px solid rgba(124,58,237,0.3);
    border-radius: 100px;
    font-size: 11px; font-weight: 600; letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--brand-light);
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.05;
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.6) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.hero-title span {
    background: linear-gradient(90deg, var(--brand-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 16px; font-weight: 400;
    color: var(--text-mid);
    max-width: 500px; margin: 0 auto 40px;
    line-height: 1.6;
}

/* ─── Capability Chips ──────────────────────────────── */
.capability-chips {
    display: flex; flex-wrap: wrap;
    gap: 8px; justify-content: center;
    margin-bottom: 48px;
}

.chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 7px 14px;
    background: var(--glass-1);
    border: 1px solid var(--border-faint);
    border-radius: 100px;
    font-size: 12px; font-weight: 500;
    color: var(--text-mid);
    transition: var(--transition);
    cursor: default;
}
.chip:hover {
    background: var(--glass-2);
    border-color: rgba(124,58,237,0.3);
    color: #fff;
}
.chip .chip-icon { font-size: 14px; }

/* ─── Dropzone ──────────────────────────────────────── */
.drop-panel {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255,255,255,0.08);
    overflow: hidden;
    transition: var(--transition);
}

.drop-zone {
    border: 2px dashed rgba(124,58,237,0.25);
    border-radius: var(--radius-lg);
    padding: 56px 32px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.drop-zone::before {
    content: '';
    position: absolute; inset: 0;
    border-radius: inherit;
    background: radial-gradient(ellipse at center, rgba(124,58,237,0.04), transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.drop-zone:hover::before,
.drop-zone.dragover::before { opacity: 1; }

.drop-zone:hover,
.drop-zone.dragover {
    border-color: rgba(124,58,237,0.6);
    background: rgba(124,58,237,0.04);
}

.drop-zone.dragover { transform: scale(0.995); }

.drop-icon {
    width: 72px; height: 72px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(124,58,237,0.2), rgba(6,182,212,0.15));
    border: 1px solid rgba(124,58,237,0.25);
    border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    font-size: 30px;
    transition: var(--transition);
    box-shadow: 0 0 30px rgba(124,58,237,0.15);
}

.drop-zone:hover .drop-icon { transform: translateY(-4px) scale(1.05); }

.drop-title {
    font-size: 20px; font-weight: 700;
    margin-bottom: 8px;
}

.drop-hint {
    font-size: 13px;
    color: var(--text-dim);
}

.drop-formats {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 6px; margin-top: 16px;
}

.fmt-tag {
    padding: 3px 10px;
    background: rgba(124,58,237,0.10);
    border: 1px solid rgba(124,58,237,0.2);
    border-radius: 6px;
    font-size: 10px; font-weight: 700;
    letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--brand-light);
}

/* ─── File List ──────────────────────────────────────── */
.file-list-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 20px 12px;
    border-bottom: 1px solid var(--border-faint);
}

.file-card {
    display: flex; align-items: center; gap: 14px;
    padding: 12px 20px;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.09);
    transition: var(--transition);
    animation: slideIn 0.3s ease forwards;
}
@keyframes slideIn {
    from { opacity:0; transform: translateX(-8px); }
    to   { opacity:1; transform: translateX(0); }
}

.file-card:hover { background: rgba(255,255,255,0.07); }
.file-card:last-child { border-bottom: none; }

.file-card .file-icon {
    width: 36px; height: 36px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; flex-shrink: 0;
    background: rgba(124,58,237,0.12);
    border: 1px solid rgba(124,58,237,0.2);
}

.file-card .file-name {
    flex: 1; font-size: 13px; font-weight: 500;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.file-card .file-size {
    font-size: 11px; color: var(--text-dim); flex-shrink: 0;
}

.file-card .file-remove {
    width: 28px; height: 28px;
    border-radius: 8px;
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px;
    transition: var(--transition);
    flex-shrink: 0;
}
.file-card .file-remove:hover {
    background: rgba(244,63,94,0.15);
    color: var(--danger);
}

/* ─── Action Section ─────────────────────────────────── */
.action-section {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255,255,255,0.09);
    overflow: hidden;
    margin-top: 16px;
}

/* ─── Segmented Format Control ───────────────────────── */
.format-seg {
    display: inline-flex;
    background: rgba(0,0,0,0.35);
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: 12px;
    padding: 4px;
    gap: 4px;
    width: 100%;
}

.seg-btn {
    flex: 1;
    display: flex; align-items: center; justify-content: center; gap: 7px;
    padding: 10px 14px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-dim);
    font-family: inherit;
    font-size: 13px; font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.seg-btn i { font-size: 13px; }

.seg-btn:hover:not(:disabled) {
    background: rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.85);
    border-color: rgba(255,255,255,0.10);
}

.seg-btn.active {
    background: linear-gradient(135deg, rgba(124,58,237,0.5) 0%, rgba(79,70,229,0.45) 100%);
    border-color: rgba(124,58,237,0.6);
    color: #fff;
    box-shadow: 0 0 16px rgba(124,58,237,0.3), inset 0 1px 0 rgba(255,255,255,0.1);
}

.seg-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.format-tab {
    display: flex; flex-direction: column; align-items: center;
    gap: 4px;
    padding: 18px 12px;
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    font-family: inherit;
}

.format-tab + .format-tab {
    border-left: 1px solid var(--border-faint);
}

.format-tab::after {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--brand), var(--accent));
    opacity: 0; border-radius: 2px 2px 0 0;
    transition: var(--transition);
}

.format-tab.active {
    color: #fff;
    background: rgba(124,58,237,0.08);
}
.format-tab.active::after { opacity: 1; }

.format-tab .tab-icon { font-size: 22px; }
.format-tab .tab-label { font-size: 13px; font-weight: 700; }
.format-tab .tab-desc { font-size: 10px; opacity: 0.6; }

.format-tab:disabled {
    opacity: 0.3; cursor: not-allowed;
}

/* ─── Accordion Options ──────────────────────────────── */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1px;
    background: rgba(255,255,255,0.10);
}

.option-group {
    background: rgba(14,10,36,0.85);
    padding: 20px;
    transition: var(--transition);
}
.option-group:hover {
    background: rgba(18,13,46,0.95);
}

.option-group-title {
    font-size: 10px; font-weight: 700;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--brand-light);
    margin-bottom: 14px;
    display: flex; align-items: center; gap: 8px;
}

.option-group-title i { opacity: 0.7; }

.option-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    transition: var(--transition);
}
.option-row:last-child { margin-bottom: 0; }
.option-row:hover { background: rgba(255,255,255,0.09); border-color: rgba(124,58,237,0.35); }

.option-label {
    font-size: 12px; font-weight: 500;
    color: var(--text-mid);
    display: flex; align-items: center; gap: 8px;
}
.option-label i { font-size: 12px; color: var(--brand-light); width: 14px; }

.option-sub {
    display: none;
    padding: 10px 0 0 0;
}
.option-sub.visible { display: block; }

/* ─── Toggle Switch ──────────────────────────────────── */
.toggle-switch {
    width: 40px; height: 22px;
    background: rgba(255,255,255,0.08);
    border-radius: 100px;
    position: relative;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.3s ease;
    border: 1px solid rgba(255,255,255,0.1);
}
.toggle-switch.active {
    background: var(--brand);
    border-color: rgba(124,58,237,0.5);
    box-shadow: 0 0 10px rgba(124,58,237,0.4);
}
.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 16px; height: 16px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
    box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}
.toggle-switch.active::after { transform: translateX(18px); }

/* ─── Mode Buttons ───────────────────────────────────── */
.mode-pills {
    display: flex; gap: 4px;
}
.mode-pill {
    flex: 1;
    padding: 7px 4px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-faint);
    border-radius: 8px;
    font-size: 10px; font-weight: 700;
    letter-spacing: 0.05em; text-transform: uppercase;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    text-align: center;
}
.mode-pill.active {
    background: rgba(124,58,237,0.2);
    border-color: rgba(124,58,237,0.5);
    color: var(--brand-light);
    box-shadow: 0 0 12px rgba(124,58,237,0.2);
}

/* ─── Inputs & Selects ───────────────────────────────── */
.input-styled, select.input-styled {
    width: 100%;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-faint);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 12px; font-weight: 500;
    color: #fff;
    outline: none;
    transition: var(--transition);
    font-family: inherit;
    appearance: none;
}
.input-styled:focus, select.input-styled:focus {
    border-color: rgba(124,58,237,0.5);
    box-shadow: 0 0 0 3px rgba(124,58,237,0.1);
}
select.input-styled option { background: #1a1030; color: #fff; }

.input-sm {
    padding: 7px 12px;
    font-size: 11px;
}

/* ─── Convert Button ─────────────────────────────────── */
.btn-convert {
    width: 100%;
    padding: 18px 32px;
    background: linear-gradient(135deg, var(--brand) 0%, #4f46e5 60%, var(--accent) 100%);
    background-size: 200% 200%;
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 15px; font-weight: 800;
    font-family: inherit;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(124,58,237,0.4), 0 0 0 1px rgba(255,255,255,0.05);
}
.btn-convert::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0; transition: var(--transition);
}
.btn-convert:hover::before { opacity: 1; }
.btn-convert:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 50px rgba(124,58,237,0.5), 0 0 0 1px rgba(255,255,255,0.1);
    background-position: right center;
}
.btn-convert:active { transform: scale(0.98); }
.btn-convert:disabled {
    opacity: 0.4; cursor: not-allowed; transform: none;
    box-shadow: none;
}

/* ─── Progress Section ───────────────────────────────── */
.progress-panel {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255,255,255,0.08);
    padding: 60px 32px;
    text-align: center;
}

.spinner {
    width: 72px; height: 72px;
    margin: 0 auto 24px;
    position: relative;
}
.spinner-ring {
    position: absolute; inset: 0;
    border-radius: 50%;
    border: 3px solid transparent;
}
.spinner-ring-outer {
    border-top-color: var(--brand);
    border-right-color: var(--brand);
    animation: spin 1s linear infinite;
}
.spinner-ring-inner {
    inset: 10px;
    border-top-color: var(--accent);
    animation: spin 0.7s linear infinite reverse;
}
.spinner-icon {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.progress-bar-track {
    background: rgba(255,255,255,0.05);
    border-radius: 100px;
    height: 4px;
    overflow: hidden;
    margin-top: 24px;
    max-width: 320px;
    margin-left: auto; margin-right: auto;
}
.progress-bar-fill {
    height: 100%; width: 0%;
    background: linear-gradient(90deg, var(--brand), var(--accent));
    border-radius: 100px;
    transition: width 0.4s ease;
    box-shadow: 0 0 8px rgba(124,58,237,0.6);
}

/* ─── Toast Notifications ────────────────────────────── */
#toast-container {
    position: fixed; bottom: 24px; right: 24px;
    z-index: 9999;
    display: flex; flex-direction: column; gap: 10px;
    pointer-events: none;
}
.toast {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 18px;
    background: rgba(20,15,40,0.95);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-faint);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    font-size: 13px; font-weight: 500;
    pointer-events: all;
    animation: toastIn 0.3s cubic-bezier(0.34,1.56,0.64,1) forwards;
    min-width: 240px; max-width: 360px;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.info    { border-left: 3px solid var(--brand); }
.toast-icon { font-size: 16px; flex-shrink: 0; }
@keyframes toastIn {
    from { opacity:0; transform: translateX(20px) scale(0.95); }
    to   { opacity:1; transform: translateX(0) scale(1); }
}

/* ─── Footer ─────────────────────────────────────────── */
.site-footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-faint);
    margin-top: 60px;
}
.footer-links {
    display: flex; align-items: center; justify-content: center;
    gap: 24px; flex-wrap: wrap;
    margin-bottom: 16px;
}
.footer-link {
    font-size: 11px; font-weight: 600;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--text-dim);
    text-decoration: none;
    transition: var(--transition);
}
.footer-link:hover { color: var(--brand-light); }
.footer-copy {
    font-size: 11px; color: rgba(255,255,255,0.2);
    letter-spacing: 0.05em;
}
.footer-badges {
    display: flex; justify-content: center; gap: 16px;
    margin-top: 16px;
}
.footer-badge-pill {
    font-size: 10px; font-weight: 600;
    color: rgba(255,255,255,0.25);
    letter-spacing: 0.08em; text-transform: uppercase;
}

/* ─── Scrollbar ──────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(124,58,237,0.25); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(124,58,237,0.45); }

/* ─── Utilities ──────────────────────────────────────── */
.hidden { display: none !important; }
.container { max-width: 880px; margin: 0 auto; padding: 0 24px; }

.section-label {
    font-size: 10px; font-weight: 700;
    letter-spacing: 0.18em; text-transform: uppercase;
    color: var(--brand-light);
    display: flex; align-items: center; gap: 8px;
    margin-bottom: 12px;
}
.section-label::after {
    content: '';
    flex: 1; height: 1px;
    background: linear-gradient(90deg, rgba(124,58,237,0.3), transparent);
}

.divider {
    height: 1px;
    background: var(--border-faint);
    margin: 4px 0;
}

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 640px) {
    .hero-title { font-size: 32px; }
    .options-grid { grid-template-columns: 1fr; }
    .format-tabs { grid-template-columns: repeat(3, 1fr); }
}