:root {
--c-bg:#0b0e17;
--c-surface: #111827;
--c-surface2:#1a2236;
--c-border:#1e2d45;
--c-accent:#00d4aa;
--c-accent2: #0ea5e9;
--c-accent3: #a78bfa;
--c-danger:#f87171;
--c-warn:#fbbf24;
--c-text:#e2e8f0;
--c-muted: #64748b;
--c-light: #94a3b8;
--glow:0 0 30px rgba(0,212,170,.25);
--glow2: 0 0 30px rgba(14,165,233,.25);
--r-sm: 8px;--r-md: 14px; --r-lg: 20px; --r-xl: 28px;
--shadow: 0 4px 24px rgba(0,0,0,.45);
--t: .25s ease;
--font-head: 'Syne', sans-serif;
--font-body: 'Plus Jakarta Sans', sans-serif;
--nav-h: 64px;
}

/* ─── RESET & BASE ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
font-family: var(--font-body);
background: var(--c-bg);
color: var(--c-text);
line-height: 1.65;
overflow-x: hidden;
min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-accent); text-decoration: none; transition: color var(--t); }
a:hover { color: var(--c-accent2); }
button { cursor: pointer; font-family: var(--font-body); }
ul { list-style: none; }
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }

/* ─── SCROLLBAR ────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 3px; }

/* ─── COOKIE BANNER ────────────────────────────────── */
#cookie-banner {
position: fixed; bottom: 0; left: 0; right: 0; z-index: 9999;
background: #0f172a;
border-top: 1px solid var(--c-border);
padding: 14px 20px;
display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
box-shadow: 0 -4px 24px rgba(0,0,0,.5);
transform: translateY(100%);
animation: slideUp .5s .8s ease forwards;
}
@keyframes slideUp { to { transform: translateY(0); } }
#cookie-banner p { flex: 1; font-size: .85rem; color: var(--c-light); min-width: 200px; }
#cookie-banner a { color: var(--c-accent); }
#cookie-dismiss {
background: var(--c-accent); color: #000; border: none;
padding: 8px 20px; border-radius: var(--r-sm); font-weight: 700;
font-size: .85rem; white-space: nowrap; transition: opacity var(--t);
}
#cookie-dismiss:hover { opacity: .85; }

/* ─── RANDOM TOOLS TICKER ──────────────────────────── */
#tools-ticker {
background: var(--c-surface);
border-bottom: 1px solid var(--c-border);
padding: 9px 0;
overflow: hidden;
position: relative;
}
.ticker-inner {
display: flex; gap: 32px;
animation: ticker 40s linear infinite;
white-space: nowrap;
width: max-content;
}
.ticker-inner:hover { animation-play-state: paused; }
@keyframes ticker { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
.ticker-item {
display: inline-flex; align-items: center; gap: 7px;
font-size: .78rem; font-weight: 600; color: var(--c-light);
text-decoration: none; transition: color var(--t);
}
.ticker-item:hover { color: var(--c-accent); }
.ticker-item svg { width: 14px; height: 14px; flex-shrink: 0; }
.ticker-label { background: var(--c-accent); color: #000; font-size: .65rem; font-weight: 800;
padding: 1px 6px; border-radius: 3px; margin-right: 6px; }

/* ─── NAVBAR ───────────────────────────────────────── */
#navbar {
position: sticky; top: 0; z-index: 1000;
height: var(--nav-h);
background: rgba(11,14,23,.92);
backdrop-filter: blur(20px);
border-bottom: 1px solid var(--c-border);
transition: box-shadow var(--t);
}
#navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.6); }
.nav-wrap {
max-width: 1280px; margin: 0 auto;
display: flex; align-items: center;
height: 100%; padding: 0 20px; gap: 24px;
}
.nav-logo {
display: flex; align-items: center; gap: 10px;
font-family: var(--font-head); font-size: 1.15rem; font-weight: 800;
color: var(--c-text); text-decoration: none; flex-shrink: 0;
}
.nav-logo span { color: var(--c-accent); }
.logo-icon {
width: 36px; height: 36px; background: linear-gradient(135deg,var(--c-accent),var(--c-accent2));
border-radius: 9px; display: flex; align-items: center; justify-content: center;
}
.nav-links { display: flex; align-items: center; gap: 4px; flex: 1; }
.nav-item { position: relative; }
.nav-link {
display: flex; align-items: center; gap: 5px;
padding: 6px 12px; border-radius: var(--r-sm);
font-size: .85rem; font-weight: 600; color: var(--c-light);
background: none; border: none; transition: color var(--t), background var(--t);
white-space: nowrap; text-decoration: none;
}
.nav-link:hover, .nav-link.active { color: var(--c-accent); background: rgba(0,212,170,.08); }
.nav-link svg { width: 12px; height: 12px; transition: transform var(--t); }
.nav-item:hover .nav-link svg { transform: rotate(180deg); }
/* Dropdown */
.nav-dropdown {
position: absolute; top: calc(100% + 8px); left: 0;
background: var(--c-surface2);
border: 1px solid var(--c-border);
border-radius: var(--r-md);
padding: 12px;
display: grid; grid-template-columns: 1fr 1fr; gap: 4px;
min-width: 460px;
opacity: 0; pointer-events: none;
transform: translateY(-6px);
transition: opacity var(--t), transform var(--t);
box-shadow: var(--shadow);
}
.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown { opacity: 1; pointer-events: auto; transform: translateY(0); }
.dd-link {
display: flex; align-items: center; gap: 9px;
padding: 9px 12px; border-radius: var(--r-sm);
font-size: .8rem; font-weight: 600; color: var(--c-light);
text-decoration: none; transition: color var(--t), background var(--t);
}
.dd-link:hover { color: var(--c-accent); background: rgba(0,212,170,.07); }
.dd-icon { width: 28px; height: 28px; border-radius: 7px;
background: var(--c-border); display: flex; align-items: center; justify-content: center;
flex-shrink: 0; font-size: .75rem; }
.nav-cta {
background: linear-gradient(135deg,var(--c-accent),var(--c-accent2));
color: #000; border: none; padding: 8px 18px;
border-radius: var(--r-sm); font-weight: 700; font-size: .85rem;
text-decoration: none; white-space: nowrap; transition: opacity var(--t);
display: flex; align-items: center; gap: 6px;
}
.nav-cta:hover { opacity: .87; color: #000; }
.nav-hamburger {
display: none; flex-direction: column; gap: 5px;
background: none; border: none; padding: 6px;
margin-left: auto;
}
.nav-hamburger span {
display: block; width: 24px; height: 2px;
background: var(--c-text); border-radius: 2px;
transition: transform var(--t), opacity var(--t);
}
/* Mobile nav */
#mobile-nav {
display: none;
position: fixed; inset: 0; z-index: 999;
background: rgba(11,14,23,.98);
backdrop-filter: blur(20px);
padding: 80px 24px 40px;
overflow-y: auto;
}
#mobile-nav.open { display: flex; flex-direction: column; gap: 8px; }
.mob-link {
display: flex; align-items: center; gap: 10px;
padding: 12px 16px; border-radius: var(--r-sm);
color: var(--c-light); font-weight: 600; font-size: .9rem;
text-decoration: none; border: 1px solid transparent;
transition: all var(--t);
}
.mob-link:hover { color: var(--c-accent); border-color: var(--c-border); background: var(--c-surface); }
.mob-section-title { font-size: .72rem; font-weight: 700; color: var(--c-muted);
text-transform: uppercase; letter-spacing: .08em; padding: 14px 16px 6px; }
.mob-close {
position: absolute; top: 18px; right: 18px;
background: var(--c-surface); border: 1px solid var(--c-border);
color: var(--c-text); width: 38px; height: 38px; border-radius: 50%;
font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
}

/* ─── BREADCRUMB ───────────────────────────────────── */
.breadcrumb {
background: var(--c-surface);
border-bottom: 1px solid var(--c-border);
padding: 10px 20px;
}
.breadcrumb-inner {
max-width: 1280px; margin: 0 auto;
display: flex; align-items: center; gap: 8px;
font-size: .8rem; color: var(--c-muted); flex-wrap: wrap;
}
.breadcrumb-inner a { color: var(--c-muted); }
.breadcrumb-inner a:hover { color: var(--c-accent); }
.breadcrumb-inner span { color: var(--c-text); font-weight: 600; }
.bc-sep { opacity: .4; }

/* ─── SECTION WRAPPER ──────────────────────────────── */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* ─── HERO ─────────────────────────────────────────── */
#hero {
position: relative; overflow: hidden;
padding: 70px 0 80px;
background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,212,170,.12) 0%, transparent 70%),
radial-gradient(ellipse 60% 40% at 90% 50%, rgba(14,165,233,.08) 0%, transparent 60%),
var(--c-bg);
}
.hero-grid {
display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-badge {
display: inline-flex; align-items: center; gap: 8px;
background: rgba(0,212,170,.1); border: 1px solid rgba(0,212,170,.3);
color: var(--c-accent); padding: 6px 14px; border-radius: 999px;
font-size: .78rem; font-weight: 700; letter-spacing: .05em;
margin-bottom: 22px; text-transform: uppercase;
}
.hero-badge::before { content: ''; width: 8px; height: 8px; background: var(--c-accent); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }
.hero h1 {
font-family: var(--font-head); font-size: clamp(2rem,4vw,3.2rem);
font-weight: 800; line-height: 1.12; letter-spacing: -.02em;
margin-bottom: 20px;
}
.hero h1 em { font-style: normal; color: var(--c-accent); }
.hero p.lead {
font-size: 1.05rem; color: var(--c-light); line-height: 1.75;
margin-bottom: 32px; max-width: 520px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
display: inline-flex; align-items: center; gap: 8px;
background: linear-gradient(135deg,var(--c-accent),var(--c-accent2));
color: #000; border: none; padding: 13px 28px;
border-radius: var(--r-md); font-weight: 700; font-size: .95rem;
transition: transform var(--t), box-shadow var(--t), opacity var(--t);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--glow); color: #000; opacity: .92; }
.btn-outline {
display: inline-flex; align-items: center; gap: 8px;
background: transparent; color: var(--c-text); border: 1.5px solid var(--c-border);
padding: 12px 26px; border-radius: var(--r-md); font-weight: 600; font-size: .95rem;
transition: border-color var(--t), color var(--t), background var(--t);
}
.btn-outline:hover { border-color: var(--c-accent); color: var(--c-accent); background: rgba(0,212,170,.06); }
.hero-stats {
display: flex; gap: 28px; flex-wrap: wrap; margin-top: 36px;
}
.hero-stat { text-align: center; }
.hero-stat strong { display: block; font-family: var(--font-head); font-size: 1.6rem; color: var(--c-accent); }
.hero-stat span { font-size: .78rem; color: var(--c-muted); }
/* Waveform hero visual */
.hero-visual {
position: relative;
}
.hero-card {
background: var(--c-surface);
border: 1px solid var(--c-border);
border-radius: var(--r-xl);
padding: 28px;
box-shadow: var(--shadow);
position: relative; overflow: hidden;
}
.hero-card::before {
content: ''; position: absolute; inset: 0;
background: linear-gradient(135deg,rgba(0,212,170,.04),rgba(14,165,233,.04));
pointer-events: none;
}
.hero-waveform-title { font-size: .78rem; font-weight: 700; color: var(--c-muted); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 16px; }
.waveform-bars {
display: flex; align-items: center; gap: 3px; height: 70px;
}
.wf-bar {
flex: 1; border-radius: 2px;
background: linear-gradient(180deg,var(--c-accent),var(--c-accent2));
animation: wfAnim 1.2s ease-in-out infinite alternate;
min-height: 4px;
}
@keyframes wfAnim { to { transform: scaleY(.2); } }
.track-list { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.track-item {
display: flex; align-items: center; gap: 12px;
background: var(--c-surface2); border: 1px solid var(--c-border);
border-radius: var(--r-md); padding: 10px 14px;
transition: border-color var(--t);
}
.track-item:hover { border-color: var(--c-accent); }
.track-thumb {
width: 36px; height: 36px; border-radius: 8px; flex-shrink: 0;
display: flex; align-items: center; justify-content: center; font-size: 1rem;
}
.track-info { flex: 1; min-width: 0; }
.track-name { font-size: .82rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.track-meta { font-size: .72rem; color: var(--c-muted); }
.track-prog { height: 3px; background: var(--c-border); border-radius: 2px; margin-top: 6px; overflow: hidden; }
.track-prog-fill { height: 100%; border-radius: 2px; background: linear-gradient(90deg,var(--c-accent),var(--c-accent2)); }

/* ─── TOOL SECTION ─────────────────────────────────── */
#tool { background: var(--c-bg); }
.tool-wrap {
background: var(--c-surface);
border: 1px solid var(--c-border);
border-radius: var(--r-xl);
overflow: hidden;
box-shadow: var(--shadow);
}
.tool-header {
background: var(--c-surface2);
border-bottom: 1px solid var(--c-border);
padding: 18px 24px;
display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.tool-title { font-family: var(--font-head); font-size: 1.1rem; font-weight: 800; flex: 1; }
.tool-badge { background: rgba(0,212,170,.12); color: var(--c-accent); border: 1px solid rgba(0,212,170,.3); font-size: .72rem; font-weight: 700; padding: 3px 10px; border-radius: 999px; }

/* Drop Zone */
.dropzone {
margin: 24px; border: 2px dashed var(--c-border);
border-radius: var(--r-lg); padding: 40px 20px;
text-align: center; cursor: pointer;
transition: border-color var(--t), background var(--t);
position: relative;
}
.dropzone.drag-over { border-color: var(--c-accent); background: rgba(0,212,170,.04); }
.dropzone input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dz-icon { font-size: 3rem; margin-bottom: 14px; }
.dz-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.dz-sub { font-size: .85rem; color: var(--c-muted); }
.dz-formats {
display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 16px;
}
.fmt-chip {
background: var(--c-surface2); border: 1px solid var(--c-border);
color: var(--c-light); font-size: .72rem; font-weight: 700;
padding: 3px 10px; border-radius: 5px;
}

/* Error */
.err-msg { color: var(--c-danger); font-size: .82rem; margin: -12px 24px 0; display: none; align-items: center; gap: 6px; padding: 8px 14px; background: rgba(248,113,113,.08); border-radius: var(--r-sm); border: 1px solid rgba(248,113,113,.2); }
.err-msg.visible { display: flex; }

/* File list */
#file-list-section { padding: 0 24px 20px; display: none; }
#file-list-section.visible { display: block; }
.fl-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.fl-title { font-size: .85rem; font-weight: 700; color: var(--c-muted); text-transform: uppercase; letter-spacing: .06em; }
.fl-clear { background: none; border: 1px solid var(--c-border); color: var(--c-muted); padding: 5px 12px; border-radius: var(--r-sm); font-size: .78rem; transition: all var(--t); }
.fl-clear:hover { border-color: var(--c-danger); color: var(--c-danger); }
#file-list { display: flex; flex-direction: column; gap: 10px; }
.fi {
display: grid; grid-template-columns: 28px 1fr auto auto auto;
gap: 10px; align-items: center;
background: var(--c-surface2); border: 1px solid var(--c-border);
border-radius: var(--r-md); padding: 12px 14px;
transition: border-color var(--t), box-shadow var(--t);
cursor: grab;
}
.fi:active { cursor: grabbing; }
.fi.drag-item { opacity: .5; }
.fi.drop-target { border-color: var(--c-accent); box-shadow: var(--glow); }
.fi-drag { color: var(--c-muted); font-size: 1.1rem; }
.fi-info { min-width: 0; }
.fi-name { font-size: .85rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fi-meta { font-size: .72rem; color: var(--c-muted); margin-top: 3px; display: flex; gap: 12px; }
.fi-waveform {
display: flex; align-items: center; gap: 1.5px; height: 28px; width: 70px;
}
.fi-wf-bar { flex: 1; border-radius: 1px; background: var(--c-accent); min-height: 2px; opacity: .6; }
.fi-controls { display: flex; gap: 6px; }
.fi-btn {
background: var(--c-border); border: none; color: var(--c-light);
width: 30px; height: 30px; border-radius: 7px; font-size: .85rem;
display: flex; align-items: center; justify-content: center;
transition: background var(--t), color var(--t);
}
.fi-btn:hover { background: rgba(0,212,170,.15); color: var(--c-accent); }
.fi-btn.del:hover { background: rgba(248,113,113,.15); color: var(--c-danger); }

/* Waveform preview per file */
.fi-wf-container { height: 40px; background: var(--c-bg); border-radius: 4px; overflow: hidden; width: 100%; margin-top: 6px; }
canvas.fi-canvas { width: 100%; height: 100%; }

/* Settings */
.settings-panel { padding: 0 24px 24px; }
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: 16px; }
.setting-group label {
display: block; font-size: .78rem; font-weight: 700; color: var(--c-muted);
text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px;
}
.setting-group input[type=range] { width: 100%; accent-color: var(--c-accent); cursor: pointer; }
.range-val { font-size: .82rem; font-weight: 600; color: var(--c-accent); float: right; }
.setting-group select, .setting-group input[type=number] {
width: 100%; background: var(--c-surface2); border: 1px solid var(--c-border);
color: var(--c-text); padding: 9px 12px; border-radius: var(--r-sm);
font-family: var(--font-body); font-size: .85rem;
transition: border-color var(--t);
}
.setting-group select:focus, .setting-group input[type=number]:focus { outline: none; border-color: var(--c-accent); }
.setting-group input[type=checkbox] { accent-color: var(--c-accent); width: 16px; height: 16px; cursor: pointer; }
.checkbox-row { display: flex; align-items: center; gap: 10px; }
.checkbox-row label { text-transform: none; letter-spacing: 0; font-size: .85rem; color: var(--c-text); margin: 0; }

/* Merge Controls */
.merge-controls {
padding: 20px 24px;
border-top: 1px solid var(--c-border);
display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.btn-merge {
display: inline-flex; align-items: center; gap: 10px;
background: linear-gradient(135deg,var(--c-accent),var(--c-accent2));
color: #000; border: none; padding: 13px 30px;
border-radius: var(--r-md); font-weight: 800; font-size: 1rem;
transition: transform var(--t), box-shadow var(--t), opacity var(--t);
}
.btn-merge:hover:not(:disabled) { transform: translateY(-2px); box-shadow: var(--glow); }
.btn-merge:disabled { opacity: .4; cursor: not-allowed; }
.btn-preview {
display: inline-flex; align-items: center; gap: 8px;
background: var(--c-surface2); border: 1.5px solid var(--c-border);
color: var(--c-text); padding: 12px 22px; border-radius: var(--r-md);
font-weight: 700; font-size: .9rem;
transition: border-color var(--t), color var(--t);
}
.btn-preview:hover { border-color: var(--c-accent2); color: var(--c-accent2); }
.merge-info { font-size: .82rem; color: var(--c-muted); }

/* Progress */
#progress-section { padding: 0 24px 24px; display: none; }
#progress-section.visible { display: block; }
.progress-bar-wrap { background: var(--c-border); border-radius: 999px; height: 8px; overflow: hidden; margin: 10px 0 6px; }
.progress-bar-fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg,var(--c-accent),var(--c-accent2)); transition: width .2s; width: 0%; }
.progress-label { font-size: .82rem; color: var(--c-muted); }

/* Output player */
#output-section { padding: 0 24px 24px; display: none; }
#output-section.visible { display: block; }
.output-card {
background: linear-gradient(135deg,rgba(0,212,170,.06),rgba(14,165,233,.06));
border: 1px solid rgba(0,212,170,.25);
border-radius: var(--r-lg); padding: 20px;
}
.output-title { font-weight: 700; font-size: .95rem; margin-bottom: 14px; color: var(--c-accent); display: flex; align-items: center; gap: 8px; }
.output-player { width: 100%; margin: 10px 0; accent-color: var(--c-accent); }
.output-meta { font-size: .8rem; color: var(--c-muted); margin-bottom: 14px; display: flex; gap: 16px; flex-wrap: wrap; }
.output-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-dl {
display: inline-flex; align-items: center; gap: 8px;
background: var(--c-accent); color: #000; border: none;
padding: 11px 24px; border-radius: var(--r-md); font-weight: 700; font-size: .9rem;
transition: opacity var(--t);
}
.btn-dl:hover { opacity: .85; }
.btn-copy-link {
display: inline-flex; align-items: center; gap: 8px;
background: var(--c-surface2); border: 1.5px solid var(--c-border);
color: var(--c-text); padding: 10px 20px; border-radius: var(--r-md);
font-weight: 600; font-size: .9rem; transition: border-color var(--t);
}
.btn-copy-link:hover { border-color: var(--c-accent); }

/* Realtime validation hints */
.validation-hint { font-size: .75rem; color: var(--c-warn); margin-top: 4px; display: none; }
.validation-hint.show { display: block; }

/* ─── FEATURES ─────────────────────────────────────── */
#features { background: var(--c-surface); }
.section-label {
display: inline-block; font-size: .75rem; font-weight: 800;
text-transform: uppercase; letter-spacing: .1em; color: var(--c-accent);
margin-bottom: 14px;
}
.section-title {
font-family: var(--font-head); font-size: clamp(1.7rem,3.5vw,2.6rem);
font-weight: 800; line-height: 1.15; letter-spacing: -.02em; margin-bottom: 16px;
}
.section-title em { font-style: normal; color: var(--c-accent); }
.section-sub { font-size: 1.02rem; color: var(--c-light); max-width: 620px; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 20px; margin-top: 50px; }
.feat-card {
background: var(--c-surface2); border: 1px solid var(--c-border);
border-radius: var(--r-lg); padding: 26px;
transition: border-color var(--t), transform var(--t), box-shadow var(--t);
}
.feat-card:hover { border-color: var(--c-accent); transform: translateY(-4px); box-shadow: var(--glow); }
.feat-icon {
width: 48px; height: 48px; border-radius: 13px; margin-bottom: 18px;
display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
}
.feat-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.feat-card p { font-size: .85rem; color: var(--c-muted); line-height: 1.7; }

/* ─── HOW IT WORKS ─────────────────────────────────── */
#how-it-works { background: var(--c-bg); }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 30px; margin-top: 50px; }
.step-card {
position: relative; text-align: center; padding: 30px 20px;
background: var(--c-surface); border: 1px solid var(--c-border);
border-radius: var(--r-lg);
transition: border-color var(--t), box-shadow var(--t);
}
.step-card:hover { border-color: var(--c-accent2); box-shadow: var(--glow2); }
.step-num {
width: 50px; height: 50px; border-radius: 50%;
background: linear-gradient(135deg,var(--c-accent),var(--c-accent2));
color: #000; font-family: var(--font-head); font-weight: 800; font-size: 1.1rem;
display: flex; align-items: center; justify-content: center; margin: 0 auto 20px;
}
.step-card h3 { font-size: .95rem; font-weight: 700; margin-bottom: 10px; }
.step-card p { font-size: .83rem; color: var(--c-muted); line-height: 1.7; }
.step-connector {
position: absolute; top: 50px; right: -16px; width: 32px; height: 2px;
background: var(--c-border); display: none;
}
@media (min-width:900px) { .step-connector { display: block; } }

/* ─── SEO PARAGRAPH ────────────────────────────────── */
#seo-content { background: var(--c-surface); }
.seo-card {
background: var(--c-surface2); border: 1px solid var(--c-border);
border-radius: var(--r-xl); padding: 40px;
display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.seo-card h2 { font-family: var(--font-head); font-size: 1.5rem; font-weight: 800; margin-bottom: 16px; }
.seo-card p { font-size: .88rem; color: var(--c-light); line-height: 1.85; }
.seo-card p + p { margin-top: 14px; }

/* ─── FAQ ──────────────────────────────────────────── */
#faq { background: var(--c-bg); }
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 50px; }
.faq-item {
background: var(--c-surface); border: 1px solid var(--c-border);
border-radius: var(--r-lg); overflow: hidden;
transition: border-color var(--t);
}
.faq-item:hover { border-color: var(--c-accent); }
.faq-q {
width: 100%; text-align: left; background: none; border: none;
color: var(--c-text); padding: 18px 20px; font-weight: 700; font-size: .9rem;
display: flex; align-items: center; justify-content: space-between; gap: 14px;
cursor: pointer;
}
.faq-q svg { flex-shrink: 0; transition: transform var(--t); }
.faq-item.open .faq-q svg { transform: rotate(180deg); }
.faq-a {
max-height: 0; overflow: hidden; transition: max-height .4s ease, padding .3s ease;
font-size: .85rem; color: var(--c-muted); line-height: 1.75;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 18px; }

/* ─── CTA ──────────────────────────────────────────── */
#cta {
background: radial-gradient(ellipse 70% 80% at 50% 50%, rgba(0,212,170,.10) 0%, transparent 70%),
var(--c-surface);
text-align: center; padding: 90px 20px;
}
#cta h2 { font-family: var(--font-head); font-size: clamp(1.8rem,4vw,2.8rem); font-weight: 800; margin-bottom: 18px; letter-spacing: -.02em; }
#cta p { font-size: 1rem; color: var(--c-light); max-width: 580px; margin: 0 auto 36px; }
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-cta-primary {
display: inline-flex; align-items: center; gap: 8px;
background: linear-gradient(135deg,var(--c-accent),var(--c-accent2));
color: #000; border: none; padding: 14px 30px;
border-radius: var(--r-md); font-weight: 800; font-size: 1rem;
transition: transform var(--t), box-shadow var(--t);
}
.btn-cta-primary:hover { transform: translateY(-2px); box-shadow: var(--glow); color: #000; }
.btn-cta-sec {
display: inline-flex; align-items: center; gap: 8px;
background: var(--c-surface2); border: 1.5px solid var(--c-border);
color: var(--c-text); padding: 13px 28px; border-radius: var(--r-md); font-weight: 700; font-size: 1rem;
transition: border-color var(--t), color var(--t);
}
.btn-cta-sec:hover { border-color: var(--c-accent3); color: var(--c-accent3); }

/* ─── FOOTER ───────────────────────────────────────── */
#footer {
background: #070a12;
border-top: 1px solid var(--c-border);
padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: .85rem; color: var(--c-muted); line-height: 1.75; margin-top: 14px; max-width: 300px; }
.footer-col h4 { font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; color: var(--c-muted); margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: .83rem; color: var(--c-muted); transition: color var(--t); }
.footer-col ul li a:hover { color: var(--c-accent); }
.footer-links-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; }
.footer-links-2col a { font-size: .8rem; color: var(--c-muted); transition: color var(--t); padding: 3px 0; display: block; }
.footer-links-2col a:hover { color: var(--c-accent); }
.footer-bottom {
border-top: 1px solid var(--c-border); padding-top: 24px;
display: flex; align-items: center; justify-content: space-between;
flex-wrap: wrap; gap: 14px;
font-size: .78rem; color: var(--c-muted);
}
.footer-bottom a { color: var(--c-muted); }
.footer-bottom a:hover { color: var(--c-accent); }
.disclaimer { font-size: .72rem; color: var(--c-muted); margin-top: 20px; line-height: 1.7; border-top: 1px solid var(--c-border); padding-top: 20px; }

/* ─── UTILITY ──────────────────────────────────────── */
.text-accent { color: var(--c-accent); }
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mb-6 { margin-bottom: 24px; }

/* ─── RESPONSIVE ───────────────────────────────────── */
@media (max-width: 1024px) {
.hero-grid { grid-template-columns: 1fr; gap: 40px; }
.hero-visual { display: none; }
.seo-card { grid-template-columns: 1fr; }
.footer-grid { grid-template-columns: 1fr 1fr; }
.faq-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
.nav-links, .nav-cta { display: none; }
.nav-hamburger { display: flex; }
.hero h1 { font-size: 1.9rem; }
.section { padding: 55px 0; }
.features-grid { grid-template-columns: 1fr; }
.steps-grid { grid-template-columns: 1fr 1fr; }
.footer-grid { grid-template-columns: 1fr; gap: 30px; }
.seo-card { padding: 24px; }
.hero-stats { gap: 18px; }
.settings-grid { grid-template-columns: 1fr; }
.fi { grid-template-columns: 24px 1fr auto auto; }
.fi-waveform { display: none; }
.merge-controls { flex-direction: column; align-items: stretch; }
.btn-merge, .btn-preview { justify-content: center; }
}
@media (max-width: 480px) {
.steps-grid { grid-template-columns: 1fr; }
.cta-btns { flex-direction: column; align-items: center; }
.hero-actions { flex-direction: column; }
.btn-primary, .btn-outline { justify-content: center; }
.tool-header { padding: 14px 16px; }
.dropzone { margin: 14px; padding: 28px 14px; }
.settings-panel, #file-list-section { padding: 0 14px 14px; }
.merge-controls { padding: 14px; }
#output-section, #progress-section { padding: 0 14px 14px; }
.output-actions { flex-direction: column; }
.btn-dl, .btn-copy-link { justify-content: center; }
}

/* Floating labels for settings */
.toggle-switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
position: absolute; cursor: pointer; inset: 0;
background: var(--c-border); border-radius: 12px;
transition: background var(--t);
}
.toggle-slider::before {
content: ''; position: absolute;
width: 18px; height: 18px; left: 3px; bottom: 3px;
background: white; border-radius: 50%;
transition: transform var(--t);
}
.toggle-switch input:checked + .toggle-slider { background: var(--c-accent); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* Smooth appear animation */
.appear { opacity: 0; transform: translateY(20px); transition: opacity .5s ease, transform .5s ease; }
.appear.in { opacity: 1; transform: none; }