/* ═══════════════════════════════════════════════════
   PULSE — Layout
   App grid · Header · Sidebar · Main panel
   ═══════════════════════════════════════════════════ */

/* ═══ APP GRID ═══ */
.app{display:grid;grid-template-rows:var(--hh) 1fr;grid-template-columns:var(--lp) 1fr;height:100vh;}

/* ═══ HEADER ═══ */
.header{
  grid-column:1/-1;
  background:linear-gradient(180deg,var(--bg1) 0%,var(--bg0) 100%);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;padding:0 14px;gap:10px;z-index:100;
  position:relative;
}
.header::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent 0%,rgba(245,166,35,.25) 30%,rgba(245,166,35,.25) 70%,transparent 100%);
}

.logo{display:flex;align-items:center;gap:10px;margin-right:4px;text-decoration:none;}
.logo-mark{
  width:32px;height:32px;
  background:linear-gradient(135deg,var(--amber) 0%,#e8920a 100%);
  border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--amber-glow);flex-shrink:0;position:relative;
}
.logo-mark::before{
  content:'';position:absolute;inset:0;border-radius:8px;
  background:linear-gradient(135deg,rgba(255,255,255,.2) 0%,transparent 50%);
}
.logo-mark svg{color:#000;position:relative;z-index:1;}
.logo-text{font-family:var(--font);font-size:1.05rem;font-weight:800;letter-spacing:0.1em;color:var(--text);line-height:1;}
.logo-sub{font-family:var(--mono);font-size:0.55rem;color:var(--text3);letter-spacing:0.14em;text-transform:uppercase;margin-top:2px;}

.vsep{width:1px;height:22px;background:var(--border2);flex-shrink:0;margin:0 2px;}

.env-wrap{display:flex;align-items:center;gap:7px;}
.env-label{font-family:var(--mono);font-size:0.6rem;color:var(--text3);letter-spacing:0.1em;text-transform:uppercase;}
.env-select{
  background:var(--bg3);border:1px solid var(--border2);color:var(--amber);
  padding:5px 28px 5px 10px;border-radius:var(--r);font-family:var(--mono);font-size:0.7rem;
  cursor:pointer;appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%23f5a623' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 8px center;
  transition:border-color .15s,box-shadow .15s;
}
.env-select:focus{border-color:var(--amber);box-shadow:0 0 0 2px var(--amber4);}

.hbtn{
  display:flex;align-items:center;gap:6px;padding:6px 13px;border-radius:var(--r);
  font-size:0.7rem;font-weight:600;transition:all .15s;height:30px;letter-spacing:.02em;
  background:var(--bg3);border:1px solid var(--border2);color:var(--text2);
}
.hbtn:hover{background:var(--bg4);border-color:var(--border3);color:var(--text);}
.hbtn.amber{background:var(--amber);border-color:var(--amber);color:#000;font-weight:700;}
.hbtn.amber:hover{background:var(--amber2);}
.hbtn svg{flex-shrink:0;}

.header-right{margin-left:auto;display:flex;align-items:center;gap:10px;}

.kbd{
  display:inline-flex;align-items:center;padding:2px 5px;border-radius:3px;
  font-family:var(--mono);font-size:0.58rem;color:var(--text3);
  background:var(--bg4);border:1px solid var(--border2);
}

/* ═══ SIDEBAR ═══ */
.sidebar{
  background:linear-gradient(180deg,var(--bg1) 0%,var(--bg0) 100%);
  border-right:1px solid var(--border);
  display:flex;flex-direction:column;overflow:hidden;
}
.sidebar-tabs{display:flex;border-bottom:1px solid var(--border);flex-shrink:0;}
.stab{
  flex:1;padding:10px 6px;text-align:center;font-family:var(--mono);
  font-size:0.6rem;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--text3);cursor:pointer;transition:all .15s;border-bottom:2px solid transparent;
}
.stab:hover{color:var(--text2);}
.stab.active{color:var(--amber);border-bottom-color:var(--amber);}

.sidebar-search{padding:8px 10px;border-bottom:1px solid var(--border);flex-shrink:0;}
.sidebar-search input{
  width:100%;background:var(--bg3);border:1px solid var(--border2);
  color:var(--text2);padding:6px 10px;border-radius:var(--r);
  font-family:var(--mono);font-size:0.7rem;transition:border-color .15s;
}
.sidebar-search input:focus{border-color:var(--border3);color:var(--text);}
.sidebar-search input::placeholder{color:var(--text4);}
.sidebar-body{flex:1;overflow-y:auto;padding:10px;}

/* ═══ MAIN PANEL ═══ */
.main-panel{display:grid;grid-template-rows:auto 1fr;overflow:hidden;background:var(--bg0);}

/* Request bar */
.req-bar{
  padding:10px 16px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:8px;
  background:linear-gradient(180deg,var(--bg1) 0%,var(--bg0) 100%);
  flex-shrink:0;
}

/* Content split panes */
.content-split{display:grid;grid-template-columns:1fr 4px 1fr;height:100%;overflow:hidden;}
.pane{display:flex;flex-direction:column;overflow:hidden;}
.pane-tabs{
  display:flex;align-items:center;border-bottom:1px solid var(--border);
  background:var(--bg1);flex-shrink:0;padding:0 4px;gap:1px;
}
.pane-body{flex:1;overflow:auto;padding:0;}

/* Resize handle */
.resize-handle{
  background:var(--border);cursor:col-resize;flex-shrink:0;
  transition:background .15s;position:relative;display:flex;align-items:center;justify-content:center;
}
.resize-handle::after{
  content:'';width:2px;height:28px;background:var(--border2);border-radius:1px;
  transition:background .15s;
}
.resize-handle:hover,.resize-handle.dragging{background:rgba(245,166,35,.08);}
.resize-handle:hover::after,.resize-handle.dragging::after{background:var(--amber);}

/* ═════════════════════════════════════════════════
   RESPONSIVE DESIGN FOR MOBILE
   ═════════════════════════════════════════════════ */

/* Tablet and below: 768px */
@media (max-width: 768px) {
  /* App grid - remove sidebar from main flow */
  .app {
    grid-template-columns: 1fr;
  }

  /* Sidebar - position as overlay/drawer */
  .sidebar {
    position: fixed;
    left: 0;
    top: var(--hh);
    width: 100%;
    max-width: 280px;
    height: calc(100vh - var(--hh));
    z-index: 99;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: 2px 0 16px rgba(0, 0, 0, 0.5);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  /* Overlay backdrop for sidebar */
  .app::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 98;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .app.sidebar-open::before {
    opacity: 1;
    pointer-events: auto;
  }

  /* Show mobile menu toggle in header */
  .mobile-menu-toggle {
    display: flex !important;
  }

  /* Header adjustments */
  .header {
    padding: 0 8px;
    gap: 6px;
    overflow-x: auto;
    flex-wrap: wrap;
  }

  .header-right {
    margin-left: auto;
    gap: 6px;
  }

  /* Hide less important elements on mobile */
  .logo-sub {
    display: none;
  }

  .vsep {
    height: 16px;
    margin: 0 1px;
  }

  .kbd {
    display: none;
  }

  /* Reduce env-label visibility */
  .env-label {
    display: none;
  }

  .env-wrap {
    gap: 4px;
  }

  .hbtn {
    padding: 5px 10px;
    font-size: 0.65rem;
    height: 28px;
  }

  .hbtn svg {
    width: 11px;
    height: 11px;
  }

  /* Request bar responsive */
  .req-bar {
    padding: 8px 10px;
    gap: 6px;
    flex-wrap: wrap;
  }

  .method-select {
    width: 80px;
    font-size: 0.65rem;
    height: 34px;
  }

  .url-input {
    font-size: 0.65rem;
    height: 34px;
    padding: 0 32px 0 10px;
  }

  .send-btn {
    height: 34px;
    padding: 0 16px;
    font-size: 0.65rem;
    gap: 6px;
  }

  .save-req-btn {
    height: 34px;
    width: 34px;
    font-size: 0.6rem;
  }

  /* URL wrap should flex */
  .url-wrap {
    flex: 1;
    min-width: 100px;
  }

  /* Content split panes - stack vertically on mobile */
  .content-split {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 12px 1fr;
  }

  /* Resize handle - change orientation */
  .resize-handle {
    cursor: row-resize;
  }

  .resize-handle::after {
    width: 28px;
    height: 2px;
  }

  /* Pane adjustments */
  .pane {
    min-height: 200px;
  }

  .pane-tabs {
    padding: 0 2px;
  }

  /* Better touch target for resize handle on mobile */
  .resize-handle {
    min-height: 12px;
    padding: 4px 0;
  }
}

/* Small phones: 480px and below */
@media (max-width: 480px) {
  /* Even more compact header */
  .header {
    padding: 0 6px;
    gap: 4px;
  }

  .logo {
    margin-right: 2px;
  }

  .logo-mark {
    width: 28px;
    height: 28px;
    font-size: 0.9rem;
  }

  .logo-text {
    font-size: 0.9rem;
    letter-spacing: 0.05em;
  }

  .vsep {
    margin: 0;
  }

  .hbtn {
    padding: 4px 8px;
    font-size: 0.6rem;
    height: 26px;
    gap: 4px;
  }

  .hbtn svg {
    width: 10px;
    height: 10px;
  }

  /* Hide button text on very small screens, keep icons only */
  .hbtn span {
    display: none;
  }

  .hbtn svg {
    margin: 0;
  }

  /* Request bar - stack items */
  .req-bar {
    padding: 6px 8px;
    gap: 4px;
  }

  .method-select {
    width: 65px;
    font-size: 0.6rem;
    height: 32px;
    padding: 0 24px 0 8px;
  }

  .url-input {
    font-size: 0.6rem;
    height: 32px;
    padding: 0 28px 0 8px;
  }

  .send-btn {
    height: 32px;
    padding: 0 12px;
    font-size: 0.6rem;
  }

  .send-btn svg {
    width: 12px;
    height: 12px;
  }

  .save-req-btn {
    height: 32px;
    width: 32px;
  }

  .url-wrap {
    min-width: 80px;
  }

  /* Sidebar narrower on small phones */
  .sidebar {
    max-width: 240px;
  }

  .sidebar-search input {
    font-size: 0.65rem;
    padding: 5px 8px;
  }

  .stab {
    padding: 8px 4px;
    font-size: 0.55rem;
  }

  /* Panes minimum height for small screens */
  .pane {
    min-height: 150px;
  }
}

/* Landscape orientation on mobile */
@media (max-width: 768px) and (orientation: landscape) {
  :root {
    --hh: 40px;
  }

  .req-bar {
    padding: 6px 8px;
  }

  .pane {
    min-height: 100px;
  }

  .header {
    padding: 0 6px;
  }

  .method-select {
    height: 30px;
  }

  .url-input {
    height: 30px;
  }

  .send-btn {
    height: 30px;
  }
}

/* Extra small devices: 360px and below */
@media (max-width: 360px) {
  .header {
    padding: 0 4px;
    gap: 2px;
  }

  .logo-mark {
    width: 24px;
    height: 24px;
  }

  .logo-text {
    display: none;
  }

  .method-select {
    width: 55px;
    padding: 0 20px 0 6px;
  }

  .url-input {
    padding: 0 24px 0 6px;
  }

  .send-btn {
    padding: 0 8px;
  }

  .url-wrap {
    min-width: 60px;
  }

  .sidebar {
    max-width: 200px;
  }
}