/* ============================================
   TikDown Pro — Main Stylesheet
   TikTok-Faithful Dark Design System
   ============================================ */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.6;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--color-primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--color-secondary)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button,input,textarea,select{font-family:inherit;font-size:inherit;border:none;outline:none}
button{cursor:pointer}

/* --- Utility --- */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.text-center{text-align:center}
.text-muted{color:var(--color-muted)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* --- Grain Overlay --- */
body::before{
  content:'';position:fixed;inset:0;z-index:9999;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  opacity:.05;
}

/* --- Animations --- */
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes pulse-glow{0%,100%{box-shadow:0 0 15px var(--color-primary),0 0 30px rgba(254,44,85,.2)}50%{box-shadow:0 0 25px var(--color-secondary),0 0 50px rgba(37,244,238,.25)}}
@keyframes gradient-rotate{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
@keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}
@keyframes fade-up{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes border-dance{
  0%{border-image-source:linear-gradient(0deg,var(--color-primary),var(--color-secondary))}
  50%{border-image-source:linear-gradient(180deg,var(--color-primary),var(--color-secondary))}
  100%{border-image-source:linear-gradient(360deg,var(--color-primary),var(--color-secondary))}
}

/* --- Header / Navbar --- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(1,1,1,.85);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--color-border);
  padding:14px 0;
}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:1.35rem;color:#fff;text-decoration:none}
.logo-icon{width:36px;height:36px;border-radius:50%;object-fit:cover}
.header-nav{display:flex;align-items:center;gap:28px}
.header-nav a{color:var(--color-muted);font-size:.9rem;font-weight:500;transition:color .2s}
.header-nav a:hover{color:#fff}
.mobile-toggle{display:none;background:none;color:#fff;font-size:1.5rem;padding:4px}
.mobile-nav{
  display:none;position:fixed;inset:0;top:60px;
  background:rgba(1,1,1,.97);backdrop-filter:blur(20px);
  flex-direction:column;align-items:center;justify-content:center;gap:32px;z-index:99;
}
.mobile-nav.active{display:flex}
.mobile-nav a{color:#fff;font-size:1.2rem;font-weight:600}

/* --- Hero Section --- */
.hero{
  padding:80px 0 60px;text-align:center;
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;
  background:radial-gradient(circle at 30% 40%,rgba(254,44,85,.08) 0%,transparent 50%),
             radial-gradient(circle at 70% 60%,rgba(37,244,238,.06) 0%,transparent 50%);
  animation:float 8s ease-in-out infinite;pointer-events:none;
}
.hero-logo{
  width:80px;height:80px;margin:0 auto 28px;
  border-radius:50%;object-fit:cover;
  animation:float 4s ease-in-out infinite;
  filter:drop-shadow(0 0 20px rgba(254,44,85,.3)) drop-shadow(0 0 40px rgba(37,244,238,.2));
}
.hero h1{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(2rem,5vw,3.2rem);
  line-height:1.15;margin-bottom:16px;
  background:linear-gradient(135deg,#fff 0%,#fff 40%,var(--color-secondary) 70%,var(--color-primary) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-subtitle{
  font-size:clamp(.95rem,2vw,1.15rem);color:var(--color-muted);
  margin-bottom:40px;max-width:520px;margin-left:auto;margin-right:auto;
}
.hero-badges{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:36px}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(255,255,255,.05);border:1px solid var(--color-border);
  border-radius:100px;padding:6px 16px;font-size:.8rem;color:var(--color-muted);
}
.hero-badge svg{width:14px;height:14px}

/* --- Download Input --- */
.download-box{
  max-width:680px;margin:0 auto;position:relative;
  border-radius:16px;padding:3px;
  background:linear-gradient(90deg,var(--color-primary),var(--color-secondary),var(--color-primary));
  background-size:200% 100%;
  animation:gradient-rotate 3s linear infinite;
}
.download-box-inner{
  display:flex;align-items:center;gap:0;
  background:var(--color-card);border-radius:14px;overflow:hidden;
}
.download-input{
  flex:1;padding:18px 20px;
  background:transparent;color:#fff;
  font-family:var(--font-mono);font-size:.95rem;
}
.download-input::placeholder{color:var(--color-muted)}
.download-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:18px 32px;
  background:linear-gradient(135deg,var(--color-primary),#e0264c);
  color:#fff;font-weight:700;font-size:.95rem;
  border:none;white-space:nowrap;
  transition:transform .15s,box-shadow .3s;
}
.download-btn:hover{
  transform:scale(1.02);
  box-shadow:0 0 24px rgba(254,44,85,.4),0 0 48px rgba(254,44,85,.15);
}
.download-btn:active{transform:scale(.98)}
.download-btn svg{width:18px;height:18px}
.download-error{
  color:var(--color-primary);font-size:.85rem;margin-top:12px;
  display:none;animation:fade-up .3s ease;
}
.download-error.show{display:block}

/* --- Loading Spinner --- */
.loader-overlay{
  display:none;position:fixed;inset:0;z-index:200;
  background:rgba(1,1,1,.8);backdrop-filter:blur(8px);
  align-items:center;justify-content:center;flex-direction:column;gap:20px;
}
.loader-overlay.active{display:flex}
.loader-spinner{
  width:56px;height:56px;border:3px solid var(--color-border);
  border-top-color:var(--color-primary);border-right-color:var(--color-secondary);
  border-radius:50%;animation:spin .8s linear infinite;
}
.loader-text{color:var(--color-muted);font-size:.9rem}

/* --- Result Card --- */
.result-section{padding:40px 0;animation:fade-up .5s ease}
.result-card{
  max-width:640px;margin:0 auto;
  background:var(--color-card);border:1px solid var(--color-border);
  border-radius:16px;overflow:hidden;
  box-shadow:0 8px 32px rgba(0,0,0,.3);
}
.result-header{display:flex;gap:16px;padding:20px;align-items:flex-start}
.result-thumb{width:120px;height:160px;object-fit:cover;border-radius:10px;flex-shrink:0;background:#222}
.result-info{flex:1;min-width:0}
.result-author{font-weight:700;font-size:1rem;margin-bottom:4px;color:var(--color-secondary)}
.result-desc{font-size:.85rem;color:var(--color-muted);overflow:hidden;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical}
.result-actions{display:flex;gap:10px;padding:0 20px 20px;flex-wrap:wrap}
.btn-download{
  flex:1;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 20px;border-radius:10px;font-weight:700;font-size:.9rem;
  transition:transform .15s,box-shadow .3s;min-width:140px;
}
.btn-download:hover{transform:translateY(-2px)}
.btn-mp4{
  background:linear-gradient(135deg,var(--color-primary),#e0264c);color:#fff;
  box-shadow:0 4px 20px rgba(254,44,85,.25);
}
.btn-mp4:hover{box-shadow:0 6px 28px rgba(254,44,85,.4);color:#fff}
.btn-mp3{
  background:linear-gradient(135deg,var(--color-secondary),#1ad4cc);color:#010101;
  box-shadow:0 4px 20px rgba(37,244,238,.2);
}
.btn-mp3:hover{box-shadow:0 6px 28px rgba(37,244,238,.35);color:#010101}
.btn-copy{
  background:rgba(255,255,255,.08);color:var(--color-muted);border:1px solid var(--color-border);
  padding:14px 16px;border-radius:10px;font-weight:600;font-size:.85rem;cursor:pointer;
  transition:all .2s;
}
.btn-copy:hover{background:rgba(255,255,255,.12);color:#fff}

/* --- How It Works --- */
.how-section{padding:80px 0}
.section-title{
  font-family:var(--font-display);font-weight:800;font-size:clamp(1.5rem,3vw,2.2rem);
  text-align:center;margin-bottom:12px;
}
.section-subtitle{text-align:center;color:var(--color-muted);margin-bottom:48px;font-size:.95rem}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{
  background:rgba(28,28,28,.6);
  border:1px solid var(--color-border);border-radius:16px;
  padding:36px 28px;text-align:center;
  backdrop-filter:blur(8px);
  transition:transform .3s,border-color .3s,box-shadow .3s;
  position:relative;overflow:hidden;
}
.step-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));
  transform:scaleX(0);transition:transform .4s;transform-origin:left;
}
.step-card:hover{
  transform:translateY(-6px);
  border-color:rgba(254,44,85,.3);
  box-shadow:0 12px 40px rgba(0,0,0,.3);
}
.step-card:hover::before{transform:scaleX(1)}
.step-number{
  width:48px;height:48px;border-radius:12px;
  display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-weight:800;font-size:1.2rem;
  margin-bottom:18px;
  background:linear-gradient(135deg,rgba(254,44,85,.15),rgba(37,244,238,.1));
  color:var(--color-primary);border:1px solid rgba(254,44,85,.2);
}
.step-card h3{font-family:var(--font-display);font-weight:700;font-size:1.1rem;margin-bottom:8px}
.step-card p{font-size:.88rem;color:var(--color-muted);line-height:1.5}

/* --- Features --- */
.features-section{padding:60px 0 80px}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{
  background:rgba(28,28,28,.4);border:1px solid var(--color-border);
  border-radius:14px;padding:28px 24px;
  transition:transform .3s,border-color .3s;
}
.feature-card:hover{transform:translateY(-4px);border-color:rgba(37,244,238,.25)}
.feature-icon{
  width:44px;height:44px;border-radius:10px;
  display:inline-flex;align-items:center;justify-content:center;
  margin-bottom:14px;font-size:1.3rem;
  background:linear-gradient(135deg,rgba(37,244,238,.12),rgba(254,44,85,.08));
}
.feature-card h3{font-family:var(--font-display);font-weight:700;font-size:1rem;margin-bottom:6px}
.feature-card p{font-size:.84rem;color:var(--color-muted);line-height:1.5}

/* --- FAQ --- */
.faq-section{padding:60px 0 80px}
.faq-list{max-width:760px;margin:0 auto}
.faq-item{
  border:1px solid var(--color-border);border-radius:12px;
  margin-bottom:12px;overflow:hidden;
  transition:border-color .3s;
}
.faq-item:hover{border-color:rgba(254,44,85,.2)}
.faq-question{
  width:100%;padding:18px 24px;display:flex;align-items:center;justify-content:space-between;
  background:rgba(28,28,28,.5);color:#fff;font-weight:600;font-size:.95rem;
  cursor:pointer;border:none;text-align:left;transition:background .2s;
}
.faq-question:hover{background:rgba(28,28,28,.8)}
.faq-chevron{
  width:20px;height:20px;transition:transform .3s;flex-shrink:0;color:var(--color-muted);
}
.faq-item.active .faq-chevron{transform:rotate(180deg);color:var(--color-primary)}
.faq-answer{
  max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s;
  padding:0 24px;font-size:.9rem;color:var(--color-muted);line-height:1.7;
  background:rgba(28,28,28,.3);
}
.faq-item.active .faq-answer{max-height:300px;padding:16px 24px 20px}

/* --- Footer --- */
.site-footer{
  border-top:1px solid var(--color-border);
  padding:48px 0 28px;background:rgba(0,0,0,.4);
}
.footer-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:40px;margin-bottom:36px}
.footer-brand .logo{margin-bottom:12px}
.footer-brand p{font-size:.85rem;color:var(--color-muted);max-width:280px;line-height:1.6}
.footer-links h4{font-family:var(--font-display);font-weight:700;font-size:.9rem;margin-bottom:14px;color:#fff}
.footer-links ul{display:flex;flex-direction:column;gap:8px}
.footer-links a{color:var(--color-muted);font-size:.85rem;transition:color .2s}
.footer-links a:hover{color:var(--color-primary)}
.footer-bottom{
  text-align:center;padding-top:24px;
  border-top:1px solid var(--color-border);
  font-size:.8rem;color:var(--color-muted);
}

/* --- Ad Containers --- */
.ad-container{text-align:center;padding:16px 0;overflow:hidden}

/* --- Static Page Content --- */
.page-content{padding:60px 0;min-height:60vh}
.page-content h1{font-family:var(--font-display);font-weight:800;font-size:2rem;margin-bottom:20px}
.page-content p{color:var(--color-muted);line-height:1.8;margin-bottom:16px}
.page-content h2{font-family:var(--font-display);font-weight:700;font-size:1.4rem;margin:32px 0 12px}
.page-content ul,.page-content ol{padding-left:24px;margin-bottom:16px}
.page-content li{color:var(--color-muted);line-height:1.7;margin-bottom:6px}
.page-content a{color:var(--color-secondary);text-decoration:underline}
.layout-centered .container{max-width:800px}
.layout-wide .container{max-width:100%;padding:0 40px}

/* --- Page Forms (Contact Us, etc.) --- */
.page-content form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 680px;
  margin-top: 28px;
}
.page-content form div {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-content label {
  font-weight: 600;
  font-size: 0.9rem;
  color: #fff;
}
.page-content input[type="text"],
.page-content input[type="email"],
.page-content input[type="number"],
.page-content input[type="tel"],
.page-content input[type="password"],
.page-content select,
.page-content textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.page-content input::placeholder,
.page-content textarea::placeholder {
  color: var(--color-muted);
}
.page-content input:focus,
.page-content select:focus,
.page-content textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(254, 44, 85, 0.15);
  outline: none;
}
.page-content textarea {
  min-height: 140px;
  resize: vertical;
}
.page-content input[type="checkbox"],
.page-content input[type="radio"] {
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
  margin: 0 10px 0 0;
  vertical-align: middle;
  cursor: pointer;
}
.page-content .checkbox-group,
.page-content form div:has(input[type="checkbox"]),
.page-content form div:has(input[type="radio"]) {
  flex-direction: row;
  align-items: center;
}
.page-content .checkbox-group label,
.page-content form div:has(input[type="checkbox"]) label,
.page-content form div:has(input[type="radio"]) label {
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 0;
  cursor: pointer;
}
.page-content form .form-actions {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 16px;
  margin-top: 10px;
}
.page-content button[type="submit"],
.page-content input[type="submit"] {
  background: linear-gradient(135deg, var(--color-primary), #e0264c);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  padding: 16px 28px;
  border-radius: 12px;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.3s;
}
.page-content button[type="submit"]:hover,
.page-content input[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(254, 44, 85, 0.3);
}
.page-content button[type="reset"],
.page-content input[type="reset"] {
  background: rgba(255,255,255,0.06);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 15px 24px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.page-content button[type="reset"]:hover,
.page-content input[type="reset"]:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

/* --- Mobile Bottom Nav --- */
.mobile-bottom-nav{
  display:none;position:fixed;bottom:0;left:0;right:0;z-index:100;
  background:rgba(1,1,1,.92);backdrop-filter:blur(16px);
  border-top:1px solid var(--color-border);
  padding:8px 0 calc(8px + env(safe-area-inset-bottom));
}
.mobile-bottom-nav-inner{display:flex;justify-content:space-around}
.mobile-bottom-nav a{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  color:var(--color-muted);font-size:.65rem;font-weight:600;padding:6px 12px;
  transition:color .2s;
}
.mobile-bottom-nav a.active,.mobile-bottom-nav a:hover{color:var(--color-primary)}
.mobile-bottom-nav svg{width:22px;height:22px}

/* --- Responsive --- */
@media(max-width:1024px){
  .steps-grid,.features-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .header-nav{display:none}
  .mobile-toggle{display:block}
  .hero{padding:60px 0 40px}
  .hero h1{font-size:1.8rem}
  .download-box-inner{flex-direction:column}
  .download-input{width:100%;text-align:center}
  .download-btn{width:100%;justify-content:center;border-radius:0 0 14px 14px}
  .steps-grid,.features-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .result-header{flex-direction:column;align-items:center;text-align:center}
  .result-thumb{width:100%;height:200px}
  .result-actions{flex-direction:column}
  .btn-download{width:100%}
  .mobile-bottom-nav{display:block}
  body{padding-bottom:72px}
  .admin-wrapper{flex-direction:column}
  .admin-sidebar{width:100%}
}

/* --- Contact Form Styles --- */
.contact-form-wrap {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 40px;
  max-width: 600px;
  margin: 40px auto;
  box-shadow: 0 8px 32px rgba(0,0,0,.3);
}
.contact-form-wrap h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-bottom: 24px;
  text-align: center;
}
.contact-form .form-row {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}
.contact-form .form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.contact-form label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-muted);
}
.contact-form .form-control {
  width: 100%;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  color: #fff;
  transition: all 0.2s ease;
}
.contact-form .form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(254, 44, 85, 0.15);
}
.contact-form textarea.form-control {
  min-height: 120px;
  resize: vertical;
}
.contact-form .btn-submit {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--color-primary), #e0264c);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  margin-top: 10px;
}
.contact-form .btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(254, 44, 85, 0.4);
}
.contact-form-alert {
  display: none;
  padding: 16px;
  border-radius: 10px;
  margin-bottom: 20px;
  text-align: center;
  font-weight: 600;
}
.contact-form-alert.success {
  display: block;
  background: rgba(74, 222, 128, 0.15);
  color: #4ade80;
  border: 1px solid rgba(74, 222, 128, 0.3);
}
.contact-form-alert.error {
  display: block;
  background: rgba(254, 44, 85, 0.15);
  color: #fe2c55;
  border: 1px solid rgba(254, 44, 85, 0.3);
}
@media (max-width: 600px) {
  .contact-form .form-row {
    flex-direction: column;
    gap: 20px;
  }
}

@media(max-width:480px){
  .hero{padding:48px 0 32px}
  .hero-logo{width:56px;height:56px}
  .hero-badges{gap:8px}
  .hero-badge{font-size:.72rem;padding:5px 12px}
  .container{padding:0 16px}
}