/* ================================================
   MyStudio Clone — Design System V2 (Foundation CSS)
   Source: va.io.vn | AntiGravity Structure V6.1
   Upgraded: Sidebar Dropdowns + Tool Detail Views
   ================================================ */

:root {
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #4338ca;
  --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --bg-page: #f8fafc;
  --bg-sidebar: #ffffff;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --sidebar-width: 240px;
  --header-height: 64px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --transition-fast: all 0.2s ease;
  --transition-normal: all 0.3s ease;
}

[data-theme="dark"] {
  --bg-page: #0f172a;
  --bg-sidebar: #1e293b;
  --bg-card: #1e293b;
  --border-color: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.3);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.3);
}

*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; background: var(--bg-page); color: var(--text-primary); line-height: 1.6; overflow-x: hidden; transition: var(--transition-normal); }
a { color: inherit; text-decoration: none; }

.app-layout { display: flex; min-height: 100vh; }

/* ============ SIDEBAR ============ */
.sidebar { width: var(--sidebar-width); background: var(--bg-sidebar); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; height: 100vh; z-index: 100; transition: var(--transition-normal); overflow-y: auto; }
.sidebar-logo { display: flex; align-items: center; gap: 12px; padding: 20px 20px 16px; border-bottom: 1px solid var(--border-color); }
.sidebar-logo .logo-icon { width: 36px; height: 36px; background: var(--primary-gradient); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: white; font-weight: 700; font-size: 14px; }
.sidebar-logo .logo-img { width: 36px; height: 36px; border-radius: var(--radius-sm); object-fit: contain; }
.sidebar-logo .logo-text { font-size: 16px; font-weight: 700; color: var(--primary); }
.sidebar-nav { flex: 1; padding: 8px 0; }

.nav-item { display: flex; align-items: center; gap: 10px; padding: 9px 16px; cursor: pointer; transition: var(--transition-fast); color: var(--text-secondary); font-size: 13px; font-weight: 500; }
.nav-item:hover { background: rgba(79, 70, 229, 0.06); color: var(--primary); }
.nav-item.active { background: var(--primary); color: white; margin: 0 10px; border-radius: var(--radius-md); }
.nav-item i { width: 18px; height: 18px; }
.nav-item .chevron { margin-left: auto; font-size: 14px; transition: var(--transition-fast); font-weight: 700; }

/* ---- Dropdown Accordion ---- */
.nav-group { border-bottom: none; }
.nav-toggle.open { color: var(--primary); background: rgba(79,70,229,0.06); }
.nav-toggle.open .chevron { transform: rotate(-90deg); }
.nav-dropdown { max-height: 0; overflow: hidden; transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1); }
.nav-dropdown.open { max-height: 500px; }

.nav-sub-item { display: flex; align-items: center; gap: 10px; padding: 7px 16px 7px 44px; cursor: pointer; font-size: 13px; color: var(--text-secondary); transition: var(--transition-fast); }
.nav-sub-item:hover { background: rgba(79,70,229,0.06); color: var(--primary); }
.nav-sub-item.active { color: var(--primary); font-weight: 600; background: rgba(79,70,229,0.08); border-radius: 0 var(--radius-md) var(--radius-md) 0; margin-right: 10px; }
.nav-sub-item.disabled { opacity: 0.45; cursor: not-allowed; }
.nav-sub-item.disabled:hover { background: none; color: var(--text-secondary); }
.nav-sub-item i { width: 16px; height: 16px; }

.badge-soon { background: #fef3c7; color: #d97706; font-size: 10px; font-weight: 700; padding: 1px 7px; border-radius: 10px; margin-left: auto; }
[data-theme="dark"] .badge-soon { background: #78350f; color: #fbbf24; }

.sidebar-user { padding: 12px 16px; border-top: 1px solid var(--border-color); display: flex; align-items: center; gap: 10px; }
.sidebar-user .avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--border-color); display: flex; align-items: center; justify-content: center; color: var(--text-muted); }
.sidebar-user .user-name { font-weight: 600; font-size: 13px; }
.sidebar-user .user-role { color: var(--text-muted); font-size: 11px; }

/* ============ MAIN CONTENT ============ */
.main-content { flex: 1; margin-left: var(--sidebar-width); transition: var(--transition-normal); }

.header { height: var(--header-height); background: var(--bg-card); border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; padding: 0 28px; position: sticky; top: 0; z-index: 50; }
.header-title { font-size: 16px; font-weight: 700; }
.header-subtitle { font-size: 11px; color: var(--text-muted); }
.header-right { display: flex; align-items: center; gap: 12px; }

.search-bar { display: flex; align-items: center; gap: 8px; background: var(--bg-page); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 7px 14px; width: 260px; transition: var(--transition-fast); }
.search-bar:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.search-bar input { border: none; background: none; outline: none; font-size: 13px; color: var(--text-primary); width: 100%; font-family: inherit; }
.search-bar input::placeholder { color: var(--text-muted); }
.search-bar .shortcut { font-size: 10px; color: var(--text-muted); background: var(--bg-card); padding: 2px 6px; border-radius: 4px; border: 1px solid var(--border-color); white-space: nowrap; }

.btn-share { display: flex; align-items: center; gap: 6px; background: none; border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 7px 14px; cursor: pointer; color: var(--text-secondary); font-family: inherit; font-size: 13px; transition: var(--transition-fast); }
.btn-share:hover { border-color: var(--primary); color: var(--primary); }
.btn-theme { background: none; border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 7px; cursor: pointer; color: var(--text-secondary); font-size: 16px; transition: var(--transition-fast); display: flex; align-items: center; justify-content: center; }
.btn-theme:hover { border-color: var(--primary); color: var(--primary); }

/* ---- Hero & Tool Banner ---- */
.hero-banner, .tool-detail-banner { background: var(--primary-gradient); border-radius: var(--radius-xl); padding: 28px 36px; margin: 20px 28px; display: flex; align-items: center; justify-content: space-between; color: white; position: relative; overflow: hidden; }
.hero-banner::before, .tool-detail-banner::before { content: ''; position: absolute; top: -50%; right: -20%; width: 400px; height: 400px; background: rgba(255,255,255,0.05); border-radius: 50%; }
.hero-left { display: flex; align-items: center; gap: 20px; z-index: 1; }
.hero-icon { width: 56px; height: 56px; background: rgba(255,255,255,0.15); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-size: 24px; backdrop-filter: blur(10px); }
.hero-title { font-size: 28px; font-weight: 800; font-style: italic; letter-spacing: -0.5px; }
.hero-subtitle { font-size: 13px; opacity: 0.85; margin-top: 2px; }
.hero-clock { text-align: right; z-index: 1; }
.hero-clock .time { font-size: 32px; font-weight: 700; letter-spacing: 1px; }
.hero-clock .date { font-size: 12px; opacity: 0.8; text-transform: uppercase; }

/* ---- Category ---- */
.dashboard-content { padding: 0 28px 40px; }
.category-section { margin-top: 28px; }
.category-title { font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; color: var(--text-primary); padding-bottom: 10px; border-bottom: 1px solid var(--border-color); margin-bottom: 14px; }

/* ---- Tool Cards ---- */
.tools-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.tool-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 18px; display: flex; align-items: flex-start; gap: 12px; cursor: pointer; transition: var(--transition-normal); }
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-xl); border-color: var(--primary-light); }
.tool-card:active { transform: scale(0.98); }
.tool-card.disabled { opacity: 0.45; cursor: not-allowed; }
.tool-card.disabled:hover { transform: none; box-shadow: none; border-color: var(--border-color); }

.tool-icon { width: 40px; height: 40px; min-width: 40px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.tool-icon.indigo { background: rgba(79,70,229,0.1); color: var(--primary); }
.tool-icon.purple { background: rgba(124,58,237,0.1); color: #7c3aed; }
.tool-icon.green { background: rgba(16,185,129,0.1); color: #10b981; }
.tool-icon.amber { background: rgba(245,158,11,0.1); color: #f59e0b; }
.tool-icon.rose { background: rgba(244,63,94,0.1); color: #f43f5e; }
.tool-icon.blue { background: rgba(59,130,246,0.1); color: #3b82f6; }

.tool-name { font-size: 13px; font-weight: 600; }
.tool-desc { font-size: 11px; color: var(--text-muted); line-height: 1.4; }

/* ============ TOOL DETAIL VIEW ============ */
.tool-detail-content { padding: 0 28px 20px; }

.detail-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 20px; }
.detail-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }

/* Data Table */
.data-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13px; }
.data-table thead th { text-align: left; padding: 10px 14px; background: var(--bg-page); font-weight: 700; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); border-bottom: 2px solid var(--border-color); }
.data-table tbody td { padding: 12px 14px; border-bottom: 1px solid var(--border-color); }
.data-table tbody tr:hover { background: rgba(79,70,229,0.03); }
.data-table tbody tr:last-child td { border-bottom: none; }
.price-up { color: #10b981; font-weight: 600; }
.price-down { color: #f43f5e; font-weight: 600; }
.price-neutral { color: var(--text-primary); font-weight: 600; }

/* Converter */
.converter-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.converter-input { flex: 1; min-width: 200px; }
.converter-input label { font-size: 12px; color: var(--text-muted); font-weight: 600; display: block; margin-bottom: 6px; }
.converter-input input, .converter-input select { width: 100%; padding: 12px 14px; border: 1px solid var(--border-color); border-radius: var(--radius-md); font-size: 15px; font-family: inherit; background: var(--bg-page); color: var(--text-primary); outline: none; transition: var(--transition-fast); }
.converter-input input:focus, .converter-input select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.converter-result { flex: 1; min-width: 200px; background: rgba(16,185,129,0.05); border: 2px solid #10b981; border-radius: var(--radius-md); padding: 12px 14px; text-align: center; }
.converter-result .result-value { font-size: 24px; font-weight: 800; color: #10b981; }
.converter-result .result-label { font-size: 11px; color: var(--text-muted); }
.converter-swap { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border-color); background: var(--bg-card); display: flex; align-items: center; justify-content: center; cursor: pointer; transition: var(--transition-fast); font-size: 18px; align-self: flex-end; margin-bottom: 6px; }
.converter-swap:hover { border-color: var(--primary); color: var(--primary); }

/* Tabs */
.tabs { display: flex; gap: 4px; margin-bottom: 20px; }
.tab { padding: 8px 16px; border-radius: var(--radius-md); border: 1px solid var(--border-color); background: none; cursor: pointer; font-size: 13px; font-family: inherit; color: var(--text-secondary); transition: var(--transition-fast); }
.tab.active { background: var(--primary); color: white; border-color: var(--primary); }
.tab:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

/* Back Button */
.btn-back-dashboard { display: flex; align-items: center; gap: 8px; margin: 20px 28px; padding: 10px 20px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); cursor: pointer; font-family: inherit; font-size: 13px; color: var(--text-secondary); transition: var(--transition-fast); }
.btn-back-dashboard:hover { border-color: var(--primary); color: var(--primary); }

/* Loading Spinner */
.loading { text-align: center; padding: 40px; color: var(--text-muted); }
.loading::after { content: ''; display: inline-block; width: 24px; height: 24px; border: 3px solid var(--border-color); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; margin-left: 8px; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Hamburger */
.hamburger { display: none; background: none; border: none; font-size: 22px; color: var(--text-primary); cursor: pointer; }
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 90; }

/* ============ FOOTER ============ */
.site-footer { text-align: center; padding: 24px 28px; margin-top: 20px; border-top: 1px solid var(--border-color); color: var(--text-muted); font-size: 12px; letter-spacing: 0.3px; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1200px) { .tools-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 900px) { .tools-grid { grid-template-columns: repeat(2, 1fr); } .hero-banner, .tool-detail-banner { flex-direction: column; text-align: center; gap: 16px; } .hero-left { flex-direction: column; } .hero-clock { text-align: center; } .converter-row { flex-direction: column; } }
@media (max-width: 768px) { .sidebar { transform: translateX(-100%); } .sidebar.open { transform: translateX(0); } .sidebar-overlay.open { display: block; } .main-content { margin-left: 0; } .hamburger { display: block; } .header { padding: 0 14px; } .hero-banner, .tool-detail-banner { margin: 14px; padding: 20px; } .dashboard-content, .tool-detail-content { padding: 0 14px 28px; } .search-bar { width: 160px; } }
@media (max-width: 480px) { .tools-grid { grid-template-columns: 1fr; } .hero-title { font-size: 22px; } .hero-clock .time { font-size: 24px; } .search-bar { display: none; } .btn-share { display: none; } }