/* ============================================================
   威软FFmpeg — Premium Design System
   ============================================================ */

:root {
  /* Depth layers */
  --bg-base: #06080d;
  --bg-1: #0b0e16;
  --bg-2: #11131e;
  --bg-3: #171a26;
  --bg-4: #1e2130;

  /* Borders */
  --b-min: rgba(255,255,255,.03);
  --b-sub: rgba(255,255,255,.06);
  --b-def: rgba(255,255,255,.09);
  --b-vis: rgba(255,255,255,.14);
  --b-focus: rgba(112,144,255,.35);

  /* Text */
  --t-1: #eef0f7;
  --t-2: #a1a6bc;
  --t-3: #676c84;
  --t-4: #484c60;

  /* Accent */
  --ac: #6c8cff;
  --ac-lt: #97b0ff;
  --ac-bg: rgba(108,140,255,.1);
  --ac-glow: rgba(108,140,255,.16);

  --gr: #3ed88e;
  --gr-bg: rgba(62,216,142,.1);

  --pp: #a78bfa;
  --pp-bg: rgba(167,139,250,.1);

  --ye: #f0b848;
  --ye-bg: rgba(240,184,72,.1);

  --rd: #f46060;
  --rd-bg: rgba(244,96,96,.1);

  /* Radius */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-xl: 22px;
  --r-full: 9999px;

  /* Shadow */
  --sh-sm: 0 1px 3px rgba(0,0,0,.25);
  --sh-md: 0 4px 16px rgba(0,0,0,.35);
  --sh-lg: 0 12px 40px rgba(0,0,0,.5);
  --sh-glow: 0 0 20px rgba(108,140,255,.12);

  /* Type */
  --f: 'Inter','SF Pro Display',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --fm: 'JetBrains Mono','SF Mono','Cascadia Code',Consolas,monospace;

  /* Easing */
  --e: cubic-bezier(.2,.9,.3,1);
  --eb: cubic-bezier(.3,1.5,.6,1);
}

/* ================================================================
   RESET
   ================================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:15px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{
  font-family:var(--f);
  background:var(--bg-base);
  color:var(--t-1);
  min-height:100vh;
  display:flex;
  flex-direction:column;
  line-height:1.55
}
body::before{
  content:'';
  position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(ellipse 70% 50% at 30% -10%,rgba(108,140,255,.05),transparent),
    radial-gradient(ellipse 50% 40% at 80% 110%,rgba(167,139,250,.04),transparent)
}

::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.07);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,.14)}
::selection{background:rgba(108,140,255,.3);color:#fff}

/* ================================================================
   HEADER
   ================================================================ */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(11,14,22,.78);
  backdrop-filter:blur(24px) saturate(160%);
  -webkit-backdrop-filter:blur(24px) saturate(160%);
  border-bottom:1px solid var(--b-min)
}
.header-inner{
  max-width:1440px;margin:0 auto;height:60px;
  display:flex;align-items:center;gap:24px;padding:0 32px
}
.logo{display:flex;align-items:center;gap:12px;white-space:nowrap;user-select:none}
.logo-icon{
  width:36px;height:36px;
  background:linear-gradient(135deg,var(--ac),var(--pp));
  border-radius:var(--r-xs);display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 16px rgba(108,140,255,.35)
}
.logo-icon svg{width:18px;height:18px}
.logo-text{font-size:1.08rem;font-weight:650;letter-spacing:-.3px}
.logo-text strong{
  background:linear-gradient(135deg,var(--ac-lt),#c4b5fd);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  font-weight:750
}
.header-desc{flex:1;font-size:.78rem;color:var(--t-3);font-weight:440}
.header-badges{display:flex;gap:8px}
.badge{
  display:inline-flex;align-items:center;gap:5px;
  font-size:.66rem;font-weight:550;padding:5px 14px;border-radius:var(--r-full);
  letter-spacing:.15px;transition:transform .15s var(--e);cursor:default
}
.badge:hover{transform:translateY(-1px)}
.badge-green{background:var(--gr-bg);color:var(--gr);border:1px solid rgba(62,216,142,.22)}
.badge-blue{background:var(--ac-bg);color:var(--ac-lt);border:1px solid rgba(108,140,255,.22)}
.badge-purple{background:var(--pp-bg);color:var(--pp);border:1px solid rgba(167,139,250,.22)}
.badge svg{opacity:.8}

/* ================================================================
   LAYOUT
   ================================================================ */
.app-container{position:relative;z-index:1;flex:1;display:flex;max-width:1440px;margin:0 auto;width:100%}

/* ================================================================
   SIDEBAR
   ================================================================ */
.sidebar{
  width:224px;flex-shrink:0;
  background:rgba(17,19,30,.45);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-right:1px solid var(--b-min);
  padding:24px 10px;display:flex;flex-direction:column;gap:2px;
  position:sticky;top:60px;height:calc(100vh - 60px);overflow-y:auto
}
.sidebar-section-label{
  font-size:.6rem;font-weight:700;text-transform:uppercase;letter-spacing:1.8px;
  color:var(--t-4);padding:18px 14px 8px;margin-top:4px
}
.sidebar-section-label:first-child{margin-top:0;padding-top:6px}

.nav-btn{
  display:flex;align-items:center;gap:12px;width:100%;
  background:transparent;border:none;color:var(--t-2);
  padding:10px 14px;border-radius:var(--r-sm);
  cursor:pointer;font-size:.82rem;font-family:var(--f);font-weight:470;
  text-align:left;transition:all .18s var(--e);white-space:nowrap;position:relative
}
.nav-btn:hover{background:rgba(255,255,255,.035);color:var(--t-1)}
.nav-btn.active{
  background:var(--ac-bg);color:var(--ac-lt);font-weight:580
}
.nav-btn.active::after{
  content:'';position:absolute;left:4px;top:50%;transform:translateY(-50%);
  width:3px;height:22px;background:var(--ac);border-radius:2px
}
.nav-icon{
  width:20px;height:20px;display:flex;align-items:center;justify-content:center;
  flex-shrink:0;opacity:.5;transition:opacity .18s var(--e)
}
.nav-btn:hover .nav-icon{opacity:.75}
.nav-btn.active .nav-icon{opacity:1}

/* ================================================================
   MAIN CONTENT
   ================================================================ */
.main-content{flex:1;padding:32px;display:flex;flex-direction:column;gap:24px;overflow-y:auto;min-width:0}

/* ---- UPLOAD ZONE ---- */
.upload-zone{
  background:var(--bg-2);border:2px dashed var(--b-def);
  border-radius:var(--r-xl);transition:all .25s var(--e);
  min-height:140px;position:relative;overflow:hidden
}
.upload-zone::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 50% 60% at 50% 50%,rgba(108,140,255,.035),transparent)
}
.upload-zone:hover{border-color:var(--b-vis)}
.upload-zone.drag-over{
  border-color:var(--ac);background:rgba(108,140,255,.06);
  box-shadow:0 0 48px rgba(108,140,255,.1);transform:scale(1.004)
}

.upload-inner{
  position:relative;z-index:1;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:36px 24px 40px;text-align:center;gap:14px
}

.source-tabs{
  display:flex;gap:4px;background:var(--bg-1);border:1px solid var(--b-sub);
  border-radius:var(--r-full);padding:4px;margin-bottom:6px
}
.source-tab{
  display:inline-flex;align-items:center;gap:7px;flex:1;
  background:transparent;border:none;border-radius:var(--r-full);
  color:var(--t-3);padding:9px 24px;font-size:.8rem;font-family:var(--f);
  font-weight:520;cursor:pointer;transition:all .18s var(--e);white-space:nowrap
}
.source-tab:hover{color:var(--t-1)}
.source-tab.active{background:var(--bg-3);color:var(--ac-lt);box-shadow:var(--sh-sm);font-weight:600}
.source-tab svg{opacity:.5}
.source-tab.active svg{opacity:1}

#localPanel{display:flex;flex-direction:column;align-items:center;gap:10px;width:100%}

.upload-icon{
  width:58px;height:58px;display:flex;align-items:center;justify-content:center;
  background:var(--ac-bg);border:1px solid rgba(108,140,255,.22);
  border-radius:var(--r-md);margin-bottom:4px;color:var(--ac-lt);
  transition:all .3s var(--e)
}
.upload-zone:hover .upload-icon{box-shadow:0 0 20px rgba(108,140,255,.15);transform:translateY(-3px)}

.upload-text{font-size:.92rem;color:var(--t-2);font-weight:450}
.upload-link{color:var(--ac-lt);cursor:pointer;font-weight:620;transition:color .15s;text-decoration:none}
.upload-link:hover{color:#b0c4ff}
.upload-hint{font-size:.75rem;color:var(--t-3)}

#urlPanel{display:flex;flex-direction:column;align-items:stretch;gap:14px;width:100%;max-width:620px}
.url-input-row{display:flex;gap:10px;width:100%}
.url-input-row input[type="url"]{flex:1;font-size:.86rem;padding:11px 16px}
.url-options{display:flex;flex-direction:column;align-items:flex-start;gap:6px}
.checkbox-label{
  display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.8rem;
  color:var(--t-2);font-weight:470;user-select:none;transition:color .15s
}
.checkbox-label:hover{color:var(--t-1)}
.checkbox-label input[type="checkbox"]{width:17px;height:17px;accent-color:var(--ac);cursor:pointer;flex-shrink:0}
.url-hint{font-size:.71rem;color:var(--t-3);line-height:1.5}
.url-examples{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.url-example-label{font-size:.71rem;color:var(--t-3)}
.url-example-tag{
  font-size:.73rem;background:var(--ac-bg);border:1px solid rgba(108,140,255,.22);
  color:var(--ac-lt);border-radius:var(--r-full);padding:5px 16px;
  cursor:pointer;transition:all .18s var(--e);font-weight:500
}
.url-example-tag:hover{background:rgba(108,140,255,.22);transform:translateY(-1px)}
.url-download-progress{width:100%;display:flex;flex-direction:column;gap:8px}
.url-download-progress .progress-bar-wrap{margin-bottom:0}

/* ---- FILE PREVIEW ---- */
.file-preview{padding:22px 24px;display:flex;flex-direction:column;gap:14px}
.file-info{
  display:flex;align-items:center;gap:16px;background:var(--bg-1);
  border-radius:var(--r-lg);padding:16px 20px;border:1px solid var(--b-sub);
  transition:border-color .15s
}
.file-info:hover{border-color:var(--b-def)}
.file-thumb{
  width:52px;height:52px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-3);border-radius:var(--r-md);border:1px solid var(--b-sub);
  overflow:hidden;flex-shrink:0;font-size:1.4rem
}
.file-thumb img{width:100%;height:100%;object-fit:cover;border-radius:var(--r-md)}
.file-details{flex:1;min-width:0}
.file-name{font-weight:620;color:var(--t-1);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.9rem}
.file-meta{font-size:.73rem;color:var(--t-3);margin-top:3px}

/* ================================================================
   TAB PANELS
   ================================================================ */
.tab-panel{
  display:none;background:var(--bg-2);
  border-radius:var(--r-xl);padding:30px 32px 34px;
  border:1px solid var(--b-sub);
  animation:panelIn .35s var(--e)
}
@keyframes panelIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.tab-panel.active{display:block}

.panel-title{
  font-size:1.05rem;font-weight:700;margin-bottom:26px;
  color:var(--t-1);padding-bottom:16px;border-bottom:1px solid var(--b-min);
  letter-spacing:-.2px;display:flex;align-items:center;gap:12px
}
.panel-title::before{
  content:'';display:block;width:4px;height:22px;
  background:linear-gradient(180deg,var(--ac),var(--pp));border-radius:2px
}

/* ---- FORM ---- */
.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px 24px;margin-bottom:26px}
.form-group{display:flex;flex-direction:column;gap:8px}
.form-group.full-width{grid-column:1/-1}
label{
  font-size:.72rem;font-weight:660;color:var(--t-2);
  text-transform:uppercase;letter-spacing:.6px
}

input[type="text"],input[type="number"],input[type="url"],select,textarea{
  background:var(--bg-1);border:1px solid var(--b-def);
  border-radius:var(--r-sm);color:var(--t-1);padding:10px 14px;
  font-size:.85rem;font-family:var(--f);outline:none;
  transition:all .18s var(--e);width:100%
}
input:hover,select:hover,textarea:hover{border-color:var(--b-vis)}
input:focus,select:focus,textarea:focus{border-color:var(--b-focus);box-shadow:0 0 0 3px rgba(112,144,255,.1)}

select{
  appearance:none;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%23676c84' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:38px
}
select option{background:var(--bg-1);color:var(--t-1)}

textarea{resize:vertical;font-family:var(--fm);font-size:.79rem;line-height:1.65;min-height:84px}

input[type="color"]{padding:3px;height:40px;width:64px;border:1px solid var(--b-def);border-radius:var(--r-xs);background:var(--bg-1);cursor:pointer}
input[type="color"]:hover{border-color:var(--b-vis)}

.range-row{display:flex;align-items:center;gap:12px}
.range-row input[type="range"]{flex:1;height:6px;accent-color:var(--ac);cursor:pointer}
.range-row span:not(.hint){
  font-size:.82rem;font-weight:700;min-width:34px;text-align:center;
  color:var(--ac-lt);background:var(--ac-bg);padding:3px 10px;border-radius:var(--r-xs);
  font-variant-numeric:tabular-nums
}
.hint{font-size:.7rem;color:var(--t-3);white-space:nowrap}

.time-input-row{display:flex;align-items:center;gap:6px}
.time-input-row input{width:58px;text-align:center}
.time-input-row span{color:var(--t-3);font-weight:700;font-size:.84rem}

/* ---- INFO BOX ---- */
.info-box{
  background:var(--ac-bg);border:1px solid rgba(108,140,255,.2);
  border-radius:var(--r-lg);padding:16px 20px 16px 44px;font-size:.81rem;
  color:var(--t-2);margin-bottom:22px;line-height:1.7;position:relative
}
.info-box::before{
  content:'i';position:absolute;left:18px;top:16px;
  width:20px;height:20px;border-radius:50%;
  background:var(--ac);color:#fff;font-size:.7rem;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--f);font-style:normal
}
.info-box strong{color:var(--ac-lt);font-weight:650}
.info-box code{
  background:var(--bg-1);border:1px solid var(--b-def);
  border-radius:var(--r-xs);padding:2px 7px;
  font-family:var(--fm);font-size:.76rem;color:var(--ye)
}

/* ---- BUTTONS ---- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 22px;border-radius:var(--r-sm);border:1px solid transparent;
  font-size:.84rem;font-family:var(--f);font-weight:620;cursor:pointer;
  text-decoration:none;transition:all .18s var(--e);white-space:nowrap;
  letter-spacing:.03px;user-select:none
}
.btn:active{transform:scale(.97)}

.btn-primary{
  background:linear-gradient(135deg,var(--ac),#5578e8);color:#fff;
  box-shadow:0 2px 14px rgba(108,140,255,.32)
}
.btn-primary:hover{
  background:linear-gradient(135deg,#7d9aff,var(--ac));
  box-shadow:0 4px 22px rgba(108,140,255,.44);transform:translateY(-1px)
}
.btn-primary:disabled{
  background:rgba(108,140,255,.2);color:var(--t-3);
  cursor:not-allowed;box-shadow:none;transform:none;pointer-events:none
}

.btn-success{
  background:linear-gradient(135deg,var(--gr),#28b46a);color:#fff;
  box-shadow:0 2px 14px rgba(62,216,142,.32)
}
.btn-success:hover{
  background:linear-gradient(135deg,#56e8a2,var(--gr));
  box-shadow:0 4px 22px rgba(62,216,142,.44);transform:translateY(-1px)
}

.btn-outline{background:transparent;border-color:var(--b-vis);color:var(--t-2)}
.btn-outline:hover{background:rgba(255,255,255,.04);color:var(--t-1);border-color:var(--ac)}
.btn-sm{padding:7px 15px;font-size:.77rem;border-radius:var(--r-xs)}
.run-btn{min-width:160px}

/* ---- PROGRESS ---- */
.progress-area{
  background:var(--bg-2);border:1px solid var(--b-sub);
  border-radius:var(--r-xl);padding:22px 24px
}
.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:.82rem}
#progressLabel{color:var(--t-2);font-weight:470}
#progressPct{color:var(--ac-lt);font-weight:720;font-size:.86rem;font-variant-numeric:tabular-nums}

.progress-bar-wrap{background:var(--bg-1);border-radius:var(--r-full);height:6px;overflow:hidden;margin-bottom:16px}
.progress-bar{
  height:100%;
  background:linear-gradient(90deg,var(--ac),var(--pp),var(--ac-lt));
  background-size:200% 100%;border-radius:var(--r-full);
  transition:width .5s var(--e);
  box-shadow:0 0 18px rgba(108,140,255,.3);
  animation:shimmer 2.5s linear infinite
}
@keyframes shimmer{from{background-position:200% 0}to{background-position:-200% 0}}

.log-box{
  background:var(--bg-base);border:1px solid var(--b-sub);
  border-radius:var(--r-md);padding:14px 16px;
  font-family:var(--fm);font-size:.7rem;color:#9eceb0;
  max-height:210px;overflow-y:auto;line-height:1.6;
  white-space:pre-wrap;word-break:break-all
}
.log-box .log-err{color:var(--rd)}
.log-box .log-info{color:var(--ac-lt)}
.log-box .log-warn{color:var(--ye)}
.log-box .log-err code{background:var(--rd-bg);color:#f4a460;padding:1px 6px;border-radius:3px}

/* ---- DOWNLOAD ---- */
.download-area{
  background:var(--gr-bg);border:1px solid rgba(62,216,142,.22);
  border-radius:var(--r-xl);padding:22px 28px;
  animation:panelIn .4s var(--e)
}
.download-inner{display:flex;align-items:center;gap:18px}
.download-icon{
  width:46px;height:46px;display:flex;align-items:center;justify-content:center;
  background:rgba(62,216,142,.14);border:1px solid rgba(62,216,142,.26);
  border-radius:var(--r-md);color:var(--gr)
}
.download-info{flex:1}
.download-title{font-weight:700;color:var(--gr);font-size:1rem}
.download-meta{font-size:.75rem;color:var(--t-3);margin-top:3px}

/* ---- PROBE ---- */
.probe-result{
  margin-top:20px;background:var(--bg-base);border:1px solid var(--b-sub);
  border-radius:var(--r-lg);padding:20px;font-family:var(--fm);
  font-size:.73rem;color:var(--t-2);line-height:1.9;
  max-height:440px;overflow-y:auto;white-space:pre
}

/* ---- HIDDEN ---- */
.hidden{display:none!important}

/* ---- SPINNER ---- */
.spinner{
  display:inline-block;width:16px;height:16px;
  border:2px solid rgba(255,255,255,.2);border-top-color:#fff;
  border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---- LOADING OVERLAY ---- */
.loading-overlay{
  position:fixed;inset:0;background:rgba(6,8,13,.9);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  z-index:999;gap:26px;animation:fadeIn .25s ease
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.loading-overlay .big-spinner{
  width:56px;height:56px;border:3px solid rgba(255,255,255,.05);
  border-top-color:var(--ac);border-radius:50%;
  animation:spin .8s linear infinite;
  box-shadow:0 0 36px rgba(108,140,255,.22)
}
.loading-overlay p{color:var(--t-2);font-size:.9rem;font-weight:500}

/* ---- TOAST ---- */
.toast-container{position:fixed;bottom:28px;right:28px;display:flex;flex-direction:column;gap:12px;z-index:1000}
.toast{
  background:rgba(23,26,39,.96);border:1px solid var(--b-sub);
  border-radius:var(--r-md);padding:15px 22px;font-size:.82rem;
  color:var(--t-1);box-shadow:var(--sh-lg);
  backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);
  animation:toastIn .4s var(--eb);max-width:360px;font-weight:500
}
.toast.toast-success{border-left:3px solid var(--gr)}
.toast.toast-error{border-left:3px solid var(--rd)}
.toast.toast-info{border-left:3px solid var(--ac)}
@keyframes toastIn{from{transform:translateX(100px) scale(.9);opacity:0}to{transform:translateX(0) scale(1);opacity:1}}

/* ---- FOOTER ---- */
.footer{
  text-align:center;padding:20px;font-size:.73rem;color:var(--t-3);
  border-top:1px solid var(--b-min);
  background:rgba(17,19,30,.45);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)
}
.footer a{color:var(--ac-lt);text-decoration:none;transition:color .15s}
.footer a:hover{color:var(--ac)}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media(max-width:900px){
  .header-desc{display:none}
  .sidebar{width:58px;padding:16px 6px}
  .nav-btn span:not(.nav-icon){display:none}
  .nav-btn.active::after{display:none}
  .sidebar-section-label{display:none}
  .main-content{padding:18px}
  .form-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .header-inner{gap:10px}
  .header-badges{display:none}
  .logo-text{font-size:.9rem}
  .sidebar{display:none}
  .form-grid{grid-template-columns:1fr}
  .download-inner{flex-wrap:wrap}
  .time-input-row input{width:46px}
  .source-tab{padding:7px 14px;font-size:.75rem}
  .tab-panel{padding:20px 18px}
}