/* =============================================
   SkillsBridge - Dark Theme Stylesheet
   ============================================= */

/* CSS Variables */
:root {
    --sb-bg: #0f1117;
    --sb-bg-card: #1a1d27;
    --sb-bg-hover: #232738;
    --sb-bg-input: #1e2130;
    --sb-bg-sidebar: #13151e;
    --sb-border: #2a2d3a;
    --sb-border-light: #353850;
    --sb-text: #e4e6ef;
    --sb-text-muted: #888ca8;
    --sb-text-dim: #5a5e7a;
    --sb-accent: #6366f1;
    --sb-accent-hover: #5558e6;
    --sb-accent-light: rgba(99, 102, 241, 0.12);
    --sb-green: #22c55e;
    --sb-green-bg: rgba(34, 197, 94, 0.12);
    --sb-amber: #f59e0b;
    --sb-amber-bg: rgba(245, 158, 11, 0.12);
    --sb-red: #ef4444;
    --sb-red-bg: rgba(239, 68, 68, 0.12);
    --sb-blue: #3b82f6;
    --sb-blue-bg: rgba(59, 130, 246, 0.12);
    --sb-purple: #a855f7;
    --sb-radius: 12px;
    --sb-radius-sm: 8px;
    --sb-shadow: 0 4px 24px rgba(0,0,0,.3);
    --sb-transition: all .2s ease;
    --sb-sidebar-width: 260px;
    --sb-navbar-height: 64px;
}

/* Light Theme */
.sb-light {
    --sb-bg: #f1f5f9;
    --sb-bg-card: #ffffff;
    --sb-bg-hover: #f1f5f9;
    --sb-bg-input: #f8fafc;
    --sb-bg-sidebar: #ffffff;
    --sb-border: #e2e8f0;
    --sb-border-light: #cbd5e1;
    --sb-text: #1e293b;
    --sb-text-muted: #64748b;
    --sb-text-dim: #94a3b8;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--sb-bg);
    color: var(--sb-text);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--sb-accent); text-decoration: none; }
a:hover { color: var(--sb-accent-hover); }
img { max-width: 100%; height: auto; }

/* ===== LAYOUT ===== */
.sb-layout {
    display: flex;
    min-height: 100vh;
}

.sb-sidebar {
    width: var(--sb-sidebar-width);
    background: var(--sb-bg-sidebar);
    border-right: 1px solid var(--sb-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform .3s ease;
}

.sb-sidebar-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--sb-border);
}

.sb-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--sb-text);
}
.sb-logo:hover { color: var(--sb-text); }

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

.sb-nav-label {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--sb-text-dim);
    padding: 12px 12px 6px;
    font-weight: 600;
}

.sb-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--sb-radius-sm);
    color: var(--sb-text-muted);
    font-size: .9rem;
    font-weight: 500;
    transition: var(--sb-transition);
    margin-bottom: 2px;
}
.sb-nav-item i { width: 20px; text-align: center; font-size: 1rem; }
.sb-nav-item:hover { background: var(--sb-bg-hover); color: var(--sb-text); }
.sb-nav-item.active { background: var(--sb-accent-light); color: var(--sb-accent); }
.sb-nav-item .sb-badge { margin-left: auto; }

.sb-sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--sb-border);
}

.sb-user-mini {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--sb-radius-sm);
}
.sb-user-mini-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--sb-accent-light);
    color: var(--sb-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: .85rem;
    flex-shrink: 0;
}
.sb-user-mini-name { font-size: .85rem; font-weight: 600; }
.sb-user-mini-role { font-size: .75rem; color: var(--sb-text-muted); }

/* Main Content */
.sb-main {
    flex: 1;
    margin-left: var(--sb-sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.sb-content {
    flex: 1;
    padding: 24px 32px;
    max-width: 1400px;
    width: 100%;
}

.sb-footer {
    padding: 16px 32px;
    border-top: 1px solid var(--sb-border);
    font-size: .8rem;
    color: var(--sb-text-muted);
    text-align: center;
}
.sb-footer a { color: var(--sb-text-muted); }
.sb-footer a:hover { color: var(--sb-accent); }

/* Mobile Nav */
.sb-mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--sb-navbar-height);
    background: var(--sb-bg-sidebar);
    border-bottom: 1px solid var(--sb-border);
    z-index: 99;
    padding: 0 16px;
    align-items: center;
    justify-content: space-between;
}

.sb-mobile-toggle {
    background: none; border: none; color: var(--sb-text);
    font-size: 1.3rem; cursor: pointer; padding: 8px;
}

.sb-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 99;
}

/* ===== COMPONENTS ===== */

/* Cards */
.sb-card {
    background: var(--sb-bg-card);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius);
    padding: 20px;
    transition: var(--sb-transition);
}
.sb-card:hover { border-color: var(--sb-border-light); }

.sb-card-glass {
    background: rgba(26, 29, 39, .6);
    backdrop-filter: blur(12px);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius);
}

/* Buttons */
.sb-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--sb-radius-sm);
    font-size: .9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--sb-transition);
    text-decoration: none;
    line-height: 1;
}
.sb-btn:hover { transform: translateY(-1px); }

.sb-btn-primary {
    background: var(--sb-accent);
    color: #fff;
}
.sb-btn-primary:hover { background: var(--sb-accent-hover); color: #fff; }

.sb-btn-secondary {
    background: var(--sb-bg-hover);
    color: var(--sb-text);
    border: 1px solid var(--sb-border);
}
.sb-btn-secondary:hover { border-color: var(--sb-border-light); }

.sb-btn-ghost {
    background: transparent;
    color: var(--sb-text-muted);
}
.sb-btn-ghost:hover { background: var(--sb-bg-hover); color: var(--sb-text); }

.sb-btn-success { background: var(--sb-green); color: #fff; }
.sb-btn-danger { background: var(--sb-red); color: #fff; }

.sb-btn-sm { padding: 7px 14px; font-size: .8rem; }
.sb-btn-lg { padding: 14px 28px; font-size: 1rem; }
.sb-btn-block { display: flex; width: 100%; justify-content: center; }
.sb-btn:disabled { opacity: .5; cursor: not-allowed; }
.sb-btn:disabled:hover { transform: none; }

.sb-icon-btn {
    width: 40px; height: 40px;
    border-radius: var(--sb-radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--sb-text-muted);
    cursor: pointer;
    transition: var(--sb-transition);
    position: relative;
    font-size: 1.1rem;
}
.sb-icon-btn:hover { background: var(--sb-bg-hover); color: var(--sb-text); }

/* Badge */
.sb-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: .75rem;
    font-weight: 600;
    background: var(--sb-accent-light);
    color: var(--sb-accent);
}
.sb-badge-sm { width: 20px; height: 20px; padding: 0; justify-content: center; border-radius: 50%; position: absolute; top: 2px; right: 2px; font-size: .65rem; }
.sb-badge-green { background: var(--sb-green-bg); color: var(--sb-green); }
.sb-badge-amber { background: var(--sb-amber-bg); color: var(--sb-amber); }
.sb-badge-red { background: var(--sb-red-bg); color: var(--sb-red); }
.sb-badge-blue { background: var(--sb-blue-bg); color: var(--sb-blue); }
.sb-badge-purple { background: rgba(168, 85, 247, .12); color: var(--sb-purple); }

/* Forms */
.sb-form-group { margin-bottom: 16px; }
.sb-form-label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; color: var(--sb-text); }
.sb-form-input, .sb-form-select, .sb-form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--sb-bg-input);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius-sm);
    color: var(--sb-text);
    font-size: .9rem;
    transition: var(--sb-transition);
    outline: none;
}
.sb-form-input:focus, .sb-form-select:focus, .sb-form-textarea:focus {
    border-color: var(--sb-accent);
    box-shadow: 0 0 0 3px var(--sb-accent-light);
}
.sb-form-input::placeholder { color: var(--sb-text-dim); }
.sb-form-textarea { resize: vertical; min-height: 80px; }
.sb-form-select { cursor: pointer; }
.sb-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.sb-form-checkbox { display: flex; align-items: center; gap: 8px; font-size: .9rem; cursor: pointer; }
.sb-form-checkbox input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--sb-accent); }
.sb-form-help { font-size: .78rem; color: var(--sb-text-muted); margin-top: 4px; }

/* Grid */
.sb-grid { display: grid; gap: 16px; }
.sb-grid-2 { grid-template-columns: 1fr 1fr; }
.sb-grid-3 { grid-template-columns: repeat(3, 1fr); }
.sb-grid-4 { grid-template-columns: repeat(4, 1fr); }
.sb-grid-5 { grid-template-columns: repeat(5, 1fr); }

/* Divider */
.sb-divider { height: 1px; background: var(--sb-border); margin: 24px 0; }
.sb-divider-light { height: 1px; background: var(--sb-border); margin: 16px 0; }

/* Alert / Notification Banner */
.sb-alert {
    padding: 12px 16px;
    border-radius: var(--sb-radius-sm);
    font-size: .85rem;
    margin-bottom: 16px;
    display: none;
}
.sb-alert-success { background: var(--sb-green-bg); color: var(--sb-green); border: 1px solid rgba(34,197,94,.2); display: block; }
.sb-alert-error { background: var(--sb-red-bg); color: var(--sb-red); border: 1px solid rgba(239,68,68,.2); display: block; }
.sb-alert-info { background: var(--sb-blue-bg); color: var(--sb-blue); border: 1px solid rgba(59,130,246,.2); display: block; }

/* Stats */
.sb-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.sb-stat { padding: 20px; }
.sb-stat-icon { font-size: 1.5rem; margin-bottom: 8px; }
.sb-stat-value { font-size: 1.75rem; font-weight: 800; margin-bottom: 2px; }
.sb-stat-label { font-size: .85rem; color: var(--sb-text-muted); }
.sb-stat-trend { font-size: .78rem; font-weight: 600; }

/* Job Card */
.sb-job-card {
    background: var(--sb-bg-card);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius);
    padding: 20px;
    transition: var(--sb-transition);
    cursor: pointer;
}
.sb-job-card:hover { border-color: var(--sb-accent); transform: translateY(-2px); box-shadow: var(--sb-shadow); }
.sb-job-card-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; }
.sb-job-card-company { font-size: .8rem; color: var(--sb-text-muted); display: flex; align-items: center; gap: 6px; }
.sb-job-card-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.sb-job-card-title a { color: var(--sb-text); }
.sb-job-card-title a:hover { color: var(--sb-accent); }
.sb-job-card-meta { display: flex; gap: 16px; flex-wrap: wrap; font-size: .85rem; color: var(--sb-text-muted); }
.sb-job-card-meta span { display: flex; align-items: center; gap: 4px; }
.sb-job-card-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--sb-border); }
.sb-job-card-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.sb-job-card-tag { padding: 3px 10px; border-radius: 20px; font-size: .75rem; background: var(--sb-bg-hover); color: var(--sb-text-muted); font-weight: 500; }

/* Search Bar */
.sb-search {
    display: flex;
    gap: 0;
    background: var(--sb-bg-input);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius);
    overflow: hidden;
    transition: var(--sb-transition);
}
.sb-search:focus-within { border-color: var(--sb-accent); box-shadow: 0 0 0 3px var(--sb-accent-light); }
.sb-search input {
    flex: 1;
    padding: 14px 18px;
    background: transparent;
    border: none;
    color: var(--sb-text);
    font-size: .95rem;
    outline: none;
}
.sb-search input::placeholder { color: var(--sb-text-dim); }
.sb-search button {
    padding: 14px 24px;
    background: var(--sb-accent);
    border: none;
    color: #fff;
    cursor: pointer;
    font-weight: 600;
    transition: var(--sb-transition);
}
.sb-search button:hover { background: var(--sb-accent-hover); }

/* Tags / Skills */
.sb-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: .8rem;
    font-weight: 500;
    background: var(--sb-bg-hover);
    color: var(--sb-text);
    border: 1px solid var(--sb-border);
    transition: var(--sb-transition);
    cursor: default;
}
.sb-tag:hover { border-color: var(--sb-accent); }
.sb-tag-sm { padding: 2px 8px; font-size: .7rem; }
.sb-tag-remove { cursor: pointer; margin-left: 2px; opacity: .5; }
.sb-tag-remove:hover { opacity: 1; color: var(--sb-red); }
.sb-tag-highlight { background: var(--sb-accent-light); border-color: var(--sb-accent); color: var(--sb-accent); }

/* Skill Level Bar */
.sb-skill-bar { height: 6px; border-radius: 3px; background: var(--sb-bg-hover); overflow: hidden; margin-top: 6px; }
.sb-skill-bar-fill { height: 100%; border-radius: 3px; background: var(--sb-accent); transition: width .5s ease; }
.sb-skill-bar-fill.advanced { background: var(--sb-green); }
.sb-skill-bar-fill.intermediate { background: var(--sb-amber); }
.sb-skill-bar-fill.beginner { background: var(--sb-accent); }

/* Profile */
.sb-profile-header {
    display: flex;
    gap: 24px;
    align-items: center;
    flex-wrap: wrap;
}
.sb-avatar {
    width: 80px; height: 80px;
    border-radius: 50%;
    background: var(--sb-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--sb-accent);
    flex-shrink: 0;
    overflow: hidden;
}
.sb-avatar img { width: 100%; height: 100%; object-fit: cover; }
.sb-avatar-lg { width: 100px; height: 100px; font-size: 2rem; }
.sb-avatar-sm { width: 36px; height: 36px; font-size: .85rem; }

/* Toast */
.sb-toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.sb-toast {
    padding: 12px 20px;
    border-radius: var(--sb-radius-sm);
    font-size: .9rem;
    font-weight: 500;
    box-shadow: var(--sb-shadow);
    transform: translateX(120%);
    transition: transform .3s ease;
    max-width: 400px;
}
.sb-toast.show { transform: translateX(0); }
.sb-toast-success { background: #064e3b; color: #6ee7b7; border: 1px solid rgba(34,197,94,.3); }
.sb-toast-error { background: #450a0a; color: #fca5a5; border: 1px solid rgba(239,68,68,.3); }
.sb-toast-info { background: #0c1929; color: #93c5fd; border: 1px solid rgba(59,130,246,.3); }

/* Auth Pages */
.sb-auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--sb-bg);
}
.sb-auth-card {
    width: 100%;
    max-width: 440px;
    padding: 40px;
}
.sb-auth-card .sb-logo { justify-content: center; margin-bottom: 8px; }
.sb-auth-title { font-size: 1.75rem; font-weight: 800; text-align: center; margin-bottom: 4px; }
.sb-auth-subtitle { text-align: center; color: var(--sb-text-muted); margin-bottom: 32px; }

/* Timeline / Steps */
.sb-timeline { position: relative; padding-left: 24px; }
.sb-timeline::before { content: ''; position: absolute; left: 8px; top: 0; bottom: 0; width: 2px; background: var(--sb-border); }
.sb-timeline-item { position: relative; padding: 0 0 24px 20px; }
.sb-timeline-item::before { content: ''; position: absolute; left: -20px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--sb-accent); border: 2px solid var(--sb-bg); }

/* Loading */
.sb-loading { display: flex; align-items: center; justify-content: center; padding: 40px; }
.sb-spinner { width: 32px; height: 32px; border: 3px solid var(--sb-border); border-top-color: var(--sb-accent); border-radius: 50%; animation: sb-spin .6s linear infinite; }
@keyframes sb-spin { to { transform: rotate(360deg); } }

/* Empty State */
.sb-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--sb-text-muted);
}
.sb-empty-icon { font-size: 3rem; margin-bottom: 12px; opacity: .5; }
.sb-empty h3 { color: var(--sb-text); margin-bottom: 4px; }

/* Modal */
.sb-modal {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.sb-modal.show { display: flex; }
.sb-modal-content {
    background: var(--sb-bg-card);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 32px;
}
.sb-modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.sb-modal-title { font-size: 1.25rem; font-weight: 700; }
.sb-modal-close { background: none; border: none; color: var(--sb-text-muted); font-size: 1.25rem; cursor: pointer; }

/* Progress bar */
.sb-progress { height: 8px; border-radius: 4px; background: var(--sb-bg-hover); overflow: hidden; }
.sb-progress-fill { height: 100%; border-radius: 4px; background: var(--sb-accent); transition: width .5s ease; }

/* Tabs */
.sb-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--sb-border); margin-bottom: 24px; }
.sb-tab {
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--sb-text-muted);
    font-weight: 500;
    font-size: .9rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--sb-transition);
    margin-bottom: -1px;
}
.sb-tab:hover { color: var(--sb-text); }
.sb-tab.active { color: var(--sb-accent); border-bottom-color: var(--sb-accent); }

/* Course Card */
.sb-course-card {
    background: var(--sb-bg-card);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius);
    overflow: hidden;
    transition: var(--sb-transition);
}
.sb-course-card:hover { border-color: var(--sb-accent); transform: translateY(-2px); box-shadow: var(--sb-shadow); }
.sb-course-card-body { padding: 16px; }
.sb-course-card-title { font-weight: 600; font-size: .95rem; margin-bottom: 4px; }
.sb-course-card-provider { font-size: .8rem; color: var(--sb-text-muted); margin-bottom: 8px; }
.sb-course-card-footer { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; border-top: 1px solid var(--sb-border); font-size: .8rem; color: var(--sb-text-muted); }

/* Responsive */
@media (max-width: 1024px) {
    .sb-grid-4, .sb-grid-5 { grid-template-columns: repeat(3, 1fr); }
    .sb-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .sb-sidebar { transform: translateX(-100%); }
    .sb-sidebar.show { transform: translateX(0); }
    .sb-overlay.show { display: block; }
    .sb-mobile-nav { display: flex; }
    .sb-main { margin-left: 0; padding-top: var(--sb-navbar-height); }
    .sb-content { padding: 16px; }
    .sb-grid-2, .sb-grid-3, .sb-grid-4, .sb-grid-5 { grid-template-columns: 1fr; }
    .sb-stats { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .sb-form-row { grid-template-columns: 1fr; }
    .sb-tabs { overflow-x: auto; }
    .sb-profile-header { flex-direction: column; text-align: center; }
    .sb-auth-card { padding: 24px; }
}