/* ============================================
   IELTS Mock Test Platform — Official Style
   Clean, professional, light theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Primary brand color - official IELTS Red */
    --primary: #D42B2B;
    --primary-light: #E8453E;
    --primary-dark: #B91C1C;
    --primary-glow: rgba(212,43,43,0.1);
    
    /* Secondary/Accent color - neutral dark gray instead of blue to avoid color clashing */
    --accent: #374151;
    --accent-light: #4b5563;
    
    /* Standard status colors */
    --success: #16a34a;
    --success-light: #22c55e;
    --warning: #d97706;
    --warning-light: #f59e0b;
    --danger: #dc2626;
    --danger-light: #ef4444;
    
    /* Backgrounds - very light gray and white */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-glass: #ffffff;
    
    /* Text colors - high contrast */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --text-white: #ffffff;
    
    /* Subtle borders */
    --border-color: #e5e7eb;
    --border-hover: #d1d5db;
    
    /* Subtle shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1);
    --shadow-glow: none;
    
    /* Sharp, professional border radii */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    
    --transition: all .2s ease;
    
    /* Clean white sidebar with dark text, matching the main body */
    --sidebar-bg: #ffffff;
    --sidebar-text: #4b5563;
    --sidebar-active: #fef2f2;
    --sidebar-hover: #f3f4f6;
}

*{margin:0;padding:0;box-sizing:border-box;}

body {
    font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
    background:#f0f2f5;
    color:var(--text-primary);
    min-height:100vh;
    -webkit-font-smoothing:antialiased;
}

/* ============================================
   Layout
   ============================================ */

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

.sidebar {
    width:260px;
    background:var(--sidebar-bg);
    display:flex;
    flex-direction:column;
    position:fixed;
    top:0;left:0;bottom:0;
    z-index:50;
    transition:var(--transition);
    box-shadow:2px 0 8px rgba(0,0,0,.08);
}

.sidebar-brand {
    padding:20px;
    border-bottom:1px solid var(--border-color);
    display:flex;align-items:center;gap:12px;
}

.sidebar-brand-icon {
    width:38px;height:38px;
    background:var(--primary);
    border-radius:var(--radius-md);
    display:flex;align-items:center;justify-content:center;
    font-size:15px;font-weight:800;color:#fff;flex-shrink:0;
    letter-spacing:-0.5px;
}

.sidebar-brand-text {
    font-size:15px;font-weight:700;color:var(--text-primary);line-height:1.2;
}
.sidebar-brand-text small {
    display:block;font-size:10px;font-weight:400;
    color:var(--text-muted);text-transform:uppercase;letter-spacing:1.5px;margin-top:2px;
}

.sidebar-nav{flex:1;padding:12px 10px;overflow-y:auto;}

.sidebar-section-title {
    font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:1.5px;
    color:var(--text-muted);padding:16px 12px 6px;
}

.sidebar-link {
    display:flex;align-items:center;gap:10px;
    padding:9px 12px;border-radius:var(--radius-md);
    color:var(--sidebar-text);text-decoration:none;
    font-size:13px;font-weight:500;transition:var(--transition);margin-bottom:1px;
}
.sidebar-link:hover{background:var(--sidebar-hover);color:var(--primary-dark);}
.sidebar-link.active{background:var(--sidebar-active);color:var(--primary);font-weight:600;}
.sidebar-link svg,.sidebar-link .icon{width:18px;height:18px;flex-shrink:0;opacity:.6;}
.sidebar-link.active svg,.sidebar-link.active .icon{opacity:1;}

.sidebar-footer{padding:12px 10px;border-top:1px solid var(--border-color);}

.main-content{flex:1;margin-left:260px;min-height:100vh;background:#f0f2f5;}

.sidebar-toggle {
    position: fixed;
    top: 74px;
    left: 260px;
    width: 24px;
    height: 44px;
    border: 1px solid var(--border-color);
    border-left: 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: #fff;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 700;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 65;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.sidebar-toggle:hover { color: var(--text-primary); box-shadow: var(--shadow-md); }

.app-layout.sidebar-collapsed .sidebar { transform: translateX(-100%); }
.app-layout.sidebar-collapsed .main-content { margin-left: 0; }
.app-layout.sidebar-collapsed .sidebar-toggle { left: 0; }

.content-header {
    padding:20px 28px;
    border-bottom:1px solid var(--border-color);
    background:#fff;
    display:flex;align-items:center;justify-content:space-between;
    box-shadow:var(--shadow-sm);
}
.content-header h1{font-size:20px;font-weight:700;color:var(--text-primary);}
.content-header .breadcrumb{font-size:12px;color:var(--text-muted);}

.content-body{padding:24px 28px;}

/* ============================================
   Cards
   ============================================ */

.card {
    background:#fff;
    border:1px solid var(--border-color);
    border-radius:var(--radius-lg);
    box-shadow:var(--shadow-sm);
    transition:var(--transition);
}
.card:hover{box-shadow:var(--shadow-md);}

.card-header {
    padding:16px 20px;border-bottom:1px solid var(--border-color);
    display:flex;align-items:center;justify-content:space-between;
}
.card-header h2,.card-header h3{font-size:15px;font-weight:600;color:var(--text-primary);}
.card-body{padding:20px;}
.card-footer{padding:14px 20px;border-top:1px solid var(--border-color);background:var(--bg-secondary);}

/* ============================================
   Stats Grid
   ============================================ */

.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-bottom:24px;}

.stat-card {
    background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);
    padding:20px;transition:var(--transition);position:relative;overflow:hidden;
    box-shadow:var(--shadow-sm);
}
.stat-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--primary);opacity:0;transition:var(--transition);}
.stat-card:hover{transform:translateY(-1px);box-shadow:var(--shadow-md);}
.stat-card:hover::before{opacity:1;}
.stat-card .stat-label{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;}
.stat-card .stat-value{font-size:28px;font-weight:800;color:var(--text-primary);line-height:1;}
.stat-card .stat-value.band-score{color:var(--primary);}
.stat-card .stat-change{font-size:11px;margin-top:6px;color:var(--text-secondary);}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display:inline-flex;align-items:center;gap:6px;
    padding:8px 18px;border-radius:var(--radius-md);
    font-size:13px;font-weight:600;font-family:inherit;
    cursor:pointer;border:none;transition:var(--transition);
    text-decoration:none;white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px rgba(212,43,43,.25);}
.btn-success{background:var(--success);color:#fff;}
.btn-success:hover{background:#15803d;transform:translateY(-1px);}
.btn-warning{background:var(--warning);color:#fff;}
.btn-danger{background:var(--danger);color:#fff;}
.btn-danger:hover{background:#b91c1c;}
.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid var(--border-color);}
.btn-ghost:hover{background:var(--bg-secondary);color:var(--text-primary);border-color:var(--border-hover);}
.btn-sm{padding:5px 10px;font-size:11px;}
.btn-lg{padding:12px 24px;font-size:15px;}
.btn-icon{padding:7px;width:34px;height:34px;justify-content:center;}

/* ============================================
   Forms
   ============================================ */

.form-group{margin-bottom:16px;}
.form-label{display:block;font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:5px;text-transform:uppercase;letter-spacing:.5px;}
.form-input,.form-select,.form-textarea {
    width:100%;padding:9px 12px;background:#fff;
    border:1px solid var(--border-color);border-radius:var(--radius-md);
    color:var(--text-primary);font-size:14px;font-family:inherit;transition:var(--transition);
}
.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,75,135,.1);}
.form-textarea{resize:vertical;min-height:100px;}
.form-select{cursor:pointer;appearance:auto;}

/* ============================================
   Tables
   ============================================ */

.table-wrapper{overflow-x:auto;}
.table{width:100%;border-collapse:collapse;}
.table th{text-align:left;padding:10px 14px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);border-bottom:2px solid var(--border-color);background:var(--bg-secondary);}
.table td{padding:12px 14px;font-size:13px;color:var(--text-secondary);border-bottom:1px solid var(--border-color);}
.table tr:hover td{background:rgba(0,75,135,.02);color:var(--text-primary);}

/* ============================================
   Badges
   ============================================ */

.badge{display:inline-flex;align-items:center;padding:3px 8px;border-radius:999px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.3px;}
.badge-primary{background:rgba(0,75,135,.1);color:var(--accent);}
.badge-success{background:rgba(22,163,74,.1);color:var(--success);}
.badge-warning{background:rgba(217,119,6,.1);color:var(--warning);}
.badge-danger{background:rgba(220,38,38,.1);color:var(--danger);}
.badge-gray{background:rgba(113,128,150,.1);color:var(--text-muted);}

/* ============================================
   Alerts
   ============================================ */

.alert{padding:12px 16px;border-radius:var(--radius-md);font-size:13px;margin-bottom:16px;display:flex;align-items:center;gap:8px;border-left:4px solid transparent;}
.alert-success{background:#f0fdf4;border-left-color:var(--success);color:#166534;}
.alert-error{background:#fef2f2;border-left-color:var(--danger);color:#991b1b;}
.alert-warning{background:#fffbeb;border-left-color:var(--warning);color:#92400e;}
.alert-info{background:#eff6ff;border-left-color:var(--accent);color:#1e40af;}

/* ============================================
   Exam Interface — Official IELTS Style
   ============================================ */

.exam-layout{display:flex;height:100vh;overflow:hidden;}

.exam-header {
    position:fixed;top:0;left:0;right:0;height:52px;
    background:#ffffff;
    border-bottom:1px solid var(--border-color);
    display:flex;align-items:center;justify-content:space-between;
    padding:0 20px;z-index:100;color:var(--text-primary);
}
.exam-header .exam-title{font-size:14px;font-weight:600;color:var(--text-primary);letter-spacing:.3px;}

.exam-timer {
    display:flex;align-items:center;gap:6px;
    font-size:18px;font-weight:700;font-variant-numeric:tabular-nums;
    padding:4px 14px;border-radius:var(--radius-md);
    background:var(--bg-tertiary);color:var(--text-primary);
    border:1px solid var(--border-color);
}
.exam-timer.warning{border-color:var(--warning);color:var(--warning);animation:pulse 1s infinite;}
.exam-timer.danger{border-color:var(--danger);color:var(--danger);animation:pulse .5s infinite;}

@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.6;}}

.exam-content{margin-top:52px;display:flex;flex:1;height:calc(100vh - 52px);}

.exam-passage {
    flex:1;padding:28px 32px;overflow-y:auto;
    border-right:3px solid var(--border-color);
    background:#fff;
}
.exam-passage .passage-title{font-size:18px;font-weight:700;color:var(--text-primary);margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid var(--primary);}
.exam-passage .passage-text{font-size:15px;line-height:1.85;color:#2d3748;}
.exam-passage .passage-text p{margin-bottom:14px;text-align:justify;}

.exam-questions{flex:1;padding:28px 32px;overflow-y:auto;background:var(--bg-secondary);}

.question-block {
    background:#fff;border:1px solid var(--border-color);
    border-radius:var(--radius-md);padding:16px 18px;margin-bottom:12px;
    transition:var(--transition);box-shadow:var(--shadow-sm);
}
.question-block.answered{border-left:3px solid var(--success);}

.question-block .question-number {
    display:inline-flex;align-items:center;justify-content:center;
    width:26px;height:26px;background:var(--accent);color:#fff;
    border-radius:50%;font-size:12px;font-weight:700;margin-right:8px;
}
.question-block .question-text{font-size:14px;color:var(--text-primary);margin-bottom:12px;line-height:1.6;}
.question-block .question-instructions{font-size:12px;color:var(--accent);font-style:italic;margin-bottom:10px;white-space:pre-line;}

.question-options{display:flex;flex-direction:column;gap:6px;}
.question-option {
    display:flex;align-items:center;gap:8px;
    padding:8px 12px;border-radius:var(--radius-md);
    border:1px solid var(--border-color);cursor:pointer;
    transition:var(--transition);font-size:13px;color:var(--text-secondary);
}
.question-option:hover{border-color:var(--border-hover);background:var(--bg-tertiary);}
.question-option.selected{border-color:var(--text-primary);background:var(--bg-tertiary);color:var(--text-primary);font-weight:500;}
.question-option input[type="radio"],.question-option input[type="checkbox"]{accent-color:var(--text-primary);}

.question-input {
    width:100%;padding:7px 10px;background:#fff;
    border:1px solid var(--border-color);border-radius:var(--radius-sm);
    color:var(--text-primary);font-size:13px;font-family:inherit;
}
.question-input:focus{outline:none;border-color:var(--text-primary);box-shadow:0 0 0 2px rgba(0,0,0,.05);}

.section-tabs{display:flex;gap:2px;background:var(--bg-tertiary);padding:3px;border-radius:var(--radius-md);}
.section-tab {
    padding:6px 18px;border-radius:var(--radius-sm);font-size:12px;font-weight:600;
    cursor:pointer;transition:var(--transition);color:var(--text-muted);
    background:transparent;border:none;font-family:inherit;
}
.section-tab:hover{color:var(--text-primary);background:#fff;}
.section-tab.active{background:var(--text-primary);color:#fff;}

.question-palette{display:flex;flex-wrap:wrap;gap:4px;padding:12px;background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-md);margin-top:16px;}
.palette-item {
    width:30px;height:30px;display:flex;align-items:center;justify-content:center;
    border-radius:var(--radius-sm);font-size:11px;font-weight:600;cursor:pointer;
    transition:var(--transition);border:1px solid var(--border-color);
    color:var(--text-muted);background:#fff;
}
.palette-item.answered{background:var(--success);border-color:var(--success);color:#fff;}
.palette-item.current{border-color:var(--text-primary);box-shadow:0 0 0 2px rgba(0,0,0,.05);}

/* ============================================
   Results
   ============================================ */

.result-hero {
    text-align:center;padding:48px 32px;
    background:#ffffff;
    border:1px solid var(--border-color);border-radius:var(--radius-xl);
    margin-bottom:24px;box-shadow:var(--shadow-sm);
}
.result-hero .band-score-display{font-size:64px;font-weight:800;color:var(--primary);line-height:1;margin-bottom:6px;}
.result-hero .band-label{font-size:14px;color:var(--text-muted);font-weight:500;}
.result-hero .score-detail{font-size:16px;color:var(--text-secondary);margin-top:10px;}

.result-answer{padding:12px 16px;border-radius:var(--radius-md);margin-bottom:6px;border:1px solid var(--border-color);}
.result-answer.correct{border-color:rgba(22,163,74,.3);background:#f0fdf4;}
.result-answer.incorrect{border-color:rgba(220,38,38,.3);background:#fef2f2;}
.result-answer.unanswered{border-color:rgba(217,119,6,.3);background:#fffbeb;}

/* ============================================
   Auth / Login
   ============================================ */

.auth-wrapper {
    min-height:100vh;display:flex;align-items:center;justify-content:center;
    background:#f8f9fa;
    position:relative;overflow:hidden;
}
.auth-wrapper::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:var(--primary);}
.auth-wrapper::after{display:none;}

.auth-card {
    background:#fff;border:none;border-radius:var(--radius-xl);
    padding:40px;width:100%;max-width:420px;position:relative;z-index:1;
    box-shadow:var(--shadow-xl);
}
.auth-card .auth-logo{text-align:center;margin-bottom:28px;}
.auth-card .auth-logo .logo-icon {
    width:52px;height:52px;background:var(--primary);
    border-radius:var(--radius-lg);display:inline-flex;align-items:center;justify-content:center;
    font-size:20px;font-weight:800;color:#fff;margin-bottom:14px;
}
.auth-card .auth-title{font-size:22px;font-weight:700;color:var(--text-primary);margin-bottom:4px;}
.auth-card .auth-subtitle{font-size:13px;color:var(--text-muted);}

/* ============================================
   Generator
   ============================================ */

.generator-panel {
    background:#ffffff;
    border:1px solid var(--border-color);border-radius:var(--radius-xl);
    padding:32px;text-align:center;margin-bottom:24px;box-shadow:var(--shadow-sm);
}
.generator-panel h2{font-size:20px;font-weight:700;margin-bottom:6px;color:var(--text-primary);}
.generator-panel p{color:var(--text-muted);margin-bottom:20px;font-size:13px;}
.generator-controls{display:flex;gap:10px;justify-content:center;align-items:center;flex-wrap:wrap;}

.loading-spinner{display:none;width:18px;height:18px;border:3px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite;}
@keyframes spin{to{transform:rotate(360deg);}}

/* ============================================
   Empty States
   ============================================ */

.empty-state{text-align:center;padding:48px 32px;color:var(--text-muted);}
.empty-state .empty-icon{font-size:40px;margin-bottom:12px;opacity:.5;}
.empty-state h3{font-size:16px;font-weight:600;color:var(--text-secondary);margin-bottom:6px;}
.empty-state p{font-size:13px;max-width:360px;margin:0 auto;}

/* ============================================
   Pagination
   ============================================ */

.pagination-wrapper{display:flex;justify-content:center;padding:16px 0;}
.pagination-wrapper nav span,.pagination-wrapper nav a{color:var(--text-secondary)!important;}

/* ============================================
   Utilities
   ============================================ */

.flex{display:flex;}.flex-col{flex-direction:column;}.items-center{align-items:center;}
.justify-between{justify-content:space-between;}.justify-center{justify-content:center;}
.gap-2{gap:8px;}.gap-3{gap:12px;}.gap-4{gap:16px;}
.mt-2{margin-top:8px;}.mt-4{margin-top:16px;}.mt-6{margin-top:24px;}
.mb-4{margin-bottom:16px;}.mb-6{margin-bottom:24px;}
.p-4{padding:16px;}.p-6{padding:24px;}
.text-sm{font-size:14px;}.text-xs{font-size:12px;}.text-lg{font-size:18px;}
.text-center{text-align:center;}.text-muted{color:var(--text-muted);}
.text-success{color:var(--success);}.text-danger{color:var(--danger);}.text-warning{color:var(--warning);}
.font-bold{font-weight:700;}.font-semibold{font-weight:600;}.w-full{width:100%;}.hidden{display:none;}

/* ============================================
   Responsive
   ============================================ */

@media(max-width:1024px){
    .sidebar{transform:translateX(-100%);}
    .main-content{margin-left:0;}
    .sidebar-toggle{left:0;top:68px;}
    .app-layout.mobile-sidebar-open .sidebar{transform:translateX(0);}
    .app-layout.mobile-sidebar-open .sidebar-toggle{left:260px;}
    .exam-content{flex-direction:column;}
    .exam-passage,.exam-questions{height:50%;}
    .exam-passage{border-right:none;border-bottom:2px solid var(--border-color);}
}
@media(max-width:768px){
    .stats-grid{grid-template-columns:1fr 1fr;}
    .content-body{padding:14px;}
    .content-header{padding:14px 16px;}
}
@media(max-width:480px){.stats-grid{grid-template-columns:1fr;}}