/**
 * ═══════════════════════════════════════════════
 * KEYWORD INTELLIGENCE — Shared Design System
 * Used by: workspace, dashboard, auth pages, homepage
 * ═══════════════════════════════════════════════
 */

/* ─── Google Fonts ─── */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Outfit:wght@300;400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ─── CSS Variables (Dark Mode — default) ─── */
:root {
    --bg-app:       #080C14;
    --bg-card:      #0F172A;
    --bg-section:   #0B0F19;
    --bg-hover:     #1E293B;
    --border-color: rgba(255, 255, 255, 0.06);
    --text-primary:   #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted:     #475569;

    --color-indigo:  #6366f1;
    --color-emerald: #10b981;
    --color-violet:  #8b5cf6;
    --color-rose:    #f43f5e;
    --color-amber:   #f59e0b;

    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  14px;
    --radius-xl:  18px;
    --radius-2xl: 24px;

    --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
    --shadow-md:  0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg:  0 8px 32px rgba(0,0,0,0.5);
    --shadow-xl:  0 16px 48px rgba(0,0,0,0.6);

    --transition-fast:   0.1s ease;
    --transition-base:   0.18s ease;
    --transition-slow:   0.3s ease;

    --font-sans:  'Inter', 'Plus Jakarta Sans', sans-serif;
    --font-display: 'Outfit', sans-serif;
}

/* Light mode overrides */
.light, html:not(.dark) {
    --bg-app:       #F8FAFC;
    --bg-card:      #FFFFFF;
    --bg-section:   #F1F5F9;
    --bg-hover:     #E2E8F0;
    --border-color: #E2E8F0;
    --text-primary:   #0F172A;
    --text-secondary: #475569;
    --text-muted:     #94A3B8;
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; }

/* ─── Typography ─── */
.ds-display {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.02em;
}
.ds-heading {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.01em;
}
.ds-body { font-family: var(--font-sans); }

/* ─── Scrollbars ─── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ═══════════════════════════════════════════════
   UNIFIED APP HEADER
══════════════════════════════════════════════════ */
.app-header {
    height: 56px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 40;
    flex-shrink: 0;
    backdrop-filter: blur(8px);
}

/* Logo */
.ds-logo-link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex-shrink: 0;
}
.ds-logo-link:hover { opacity: 0.85; }
.ds-app-name {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 14px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    white-space: nowrap;
}
.ds-breadcrumb-sep {
    color: var(--text-muted);
    font-size: 16px;
    font-weight: 300;
    padding: 0 6px;
    user-select: none;
}
.ds-project-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 13px;
    color: var(--text-primary);
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
    transition: color var(--transition-fast);
}
.ds-project-name:hover { color: var(--color-indigo); }

/* Center nav tabs */
.ds-center-nav {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--bg-section);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 3px;
}
.ds-nav-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 7px;
    font-size: 12px;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    background: transparent;
    white-space: nowrap;
}
.ds-nav-tab:hover { background: var(--bg-hover); color: var(--text-primary); }
.ds-nav-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}
.ds-nav-tab.active-research { color: #a78bfa; }
.ds-nav-tab.active-grouping { color: #10b981; }

/* Right side header buttons */
.ds-icon-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}
.ds-icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

/* User avatar */
.ds-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-indigo), var(--color-emerald));
    color: #fff;
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    flex-shrink: 0;
    user-select: none;
}
.ds-avatar:hover {
    transform: scale(1.06);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.3);
}

/* ═══════════════════════════════════════════════
   BUTTONS
══════════════════════════════════════════════════ */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}
.ds-btn-primary {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: #fff;
    box-shadow: 0 2px 12px rgba(99,102,241,0.3);
}
.ds-btn-primary:hover { background: linear-gradient(135deg, #818cf8, #6366f1); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(99,102,241,0.4); }
.ds-btn-primary:active { transform: translateY(0); }

.ds-btn-emerald {
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    box-shadow: 0 2px 12px rgba(16,185,129,0.25);
}
.ds-btn-emerald:hover { background: linear-gradient(135deg, #34d399, #10b981); transform: translateY(-1px); }

.ds-btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.ds-btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }

.ds-btn-sm { padding: 5px 12px; font-size: 11px; border-radius: 7px; }
.ds-btn-lg { padding: 11px 24px; font-size: 14px; border-radius: 10px; }

/* ═══════════════════════════════════════════════
   CARDS
══════════════════════════════════════════════════ */
.ds-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}
.ds-card:hover {
    border-color: rgba(99,102,241,0.3);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    transform: translateY(-2px);
}
.ds-card-flat {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
}

/* ═══════════════════════════════════════════════
   FORM ELEMENTS
══════════════════════════════════════════════════ */
.ds-input {
    width: 100%;
    background: var(--bg-section);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 13px;
    font-family: var(--font-sans);
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.ds-input::placeholder { color: var(--text-muted); }
.ds-input:focus {
    border-color: var(--color-indigo);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.ds-label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

/* ═══════════════════════════════════════════════
   DROPDOWNS
══════════════════════════════════════════════════ */
.ds-dropdown {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 6px;
    z-index: 50;
    min-width: 180px;
    animation: dsDropIn 0.15s ease-out forwards;
}
.ds-dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 7px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
}
.ds-dropdown-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.ds-dropdown-item.danger { color: #f87171; }
.ds-dropdown-item.danger:hover { background: rgba(239,68,68,0.08); }
.ds-dropdown-divider { height: 1px; background: var(--border-color); margin: 4px 0; }

/* ═══════════════════════════════════════════════
   BADGES
══════════════════════════════════════════════════ */
.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 99px;
    font-size: 10px;
    font-weight: 700;
    font-family: var(--font-display);
}
.ds-badge-indigo { background: rgba(99,102,241,0.1); color: #818cf8; border: 1px solid rgba(99,102,241,0.2); }
.ds-badge-emerald { background: rgba(16,185,129,0.1); color: #34d399; border: 1px solid rgba(16,185,129,0.2); }
.ds-badge-amber { background: rgba(245,158,11,0.1); color: #fbbf24; border: 1px solid rgba(245,158,11,0.2); }
.ds-badge-muted { background: var(--bg-hover); color: var(--text-muted); border: 1px solid var(--border-color); }

/* ═══════════════════════════════════════════════
   KEYFRAME ANIMATIONS
══════════════════════════════════════════════════ */
@keyframes dsDropIn {
    from { opacity: 0; transform: translateY(-6px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes dsFadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes dsPulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.5; }
}
@keyframes dsSlideIn {
    from { opacity: 0; transform: translateX(16px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes dsScaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to   { opacity: 1; transform: scale(1); }
}

.ds-animate-fade-up   { animation: dsFadeUp  0.3s ease-out both; }
.ds-animate-scale-up  { animation: dsScaleUp 0.2s ease-out both; }
.ds-animate-slide-in  { animation: dsSlideIn 0.25s ease-out both; }

/* Staggered children animations */
.ds-stagger > *:nth-child(1) { animation-delay: 0ms; }
.ds-stagger > *:nth-child(2) { animation-delay: 60ms; }
.ds-stagger > *:nth-child(3) { animation-delay: 120ms; }
.ds-stagger > *:nth-child(4) { animation-delay: 180ms; }
.ds-stagger > *:nth-child(5) { animation-delay: 240ms; }
.ds-stagger > *:nth-child(6) { animation-delay: 300ms; }

/* ═══════════════════════════════════════════════
   AUTH PAGES — Split screen
══════════════════════════════════════════════════ */
.auth-layout {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
}
@media (max-width: 768px) {
    .auth-layout { grid-template-columns: 1fr; }
    .auth-left-panel { display: none; }
}
.auth-left-panel {
    background: linear-gradient(160deg, #0c0f1e 0%, #111827 50%, #0a0f1d 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 60px 56px;
    position: relative;
    overflow: hidden;
}
.auth-left-panel::before {
    content: '';
    position: absolute;
    top: -20%;
    left: -20%;
    width: 70%;
    height: 70%;
    background: radial-gradient(circle, rgba(99,102,241,0.15), transparent 70%);
    pointer-events: none;
}
.auth-left-panel::after {
    content: '';
    position: absolute;
    bottom: -10%;
    right: -10%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(16,185,129,0.1), transparent 70%);
    pointer-events: none;
}
.auth-right-panel {
    background: var(--bg-app);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 48px 40px;
}
.auth-form-card {
    width: 100%;
    max-width: 400px;
}
.auth-benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
}
.auth-benefit-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(99,102,241,0.15);
    border: 1px solid rgba(99,102,241,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ═══════════════════════════════════════════════
   DASHBOARD — Project Cards
══════════════════════════════════════════════════ */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-indigo), var(--color-emerald));
    opacity: 0;
    transition: opacity var(--transition-base);
}
.project-card:hover {
    border-color: rgba(99,102,241,0.3);
    box-shadow: 0 8px 32px rgba(0,0,0,0.35);
    transform: translateY(-3px);
}
.project-card:hover::before { opacity: 1; }

.project-card-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
}
.project-card-stat strong {
    color: var(--text-secondary);
    font-weight: 700;
}

/* ═══════════════════════════════════════════════
   HOMEPAGE — Public landing page
══════════════════════════════════════════════════ */
.hp-nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 50;
    height: 64px;
    display: flex;
    align-items: center;
    background: rgba(8, 12, 20, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.hp-hero-gradient {
    background: radial-gradient(ellipse at 30% 0%, rgba(99,102,241,0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 80%, rgba(16,185,129,0.08) 0%, transparent 60%),
                #080C14;
}
.hp-feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 28px 24px;
    transition: all var(--transition-base);
}
.hp-feature-card:hover {
    border-color: rgba(99,102,241,0.25);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.4);
}
.hp-feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.hp-step-connector {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-indigo), transparent);
    margin: 0 auto;
}
.hp-pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    padding: 32px 28px;
    position: relative;
    transition: all var(--transition-base);
}
.hp-pricing-card.featured {
    border-color: rgba(99,102,241,0.4);
    background: linear-gradient(180deg, rgba(99,102,241,0.06) 0%, var(--bg-card) 100%);
}
.hp-pricing-card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(0,0,0,0.4); }
.hp-faq-item {
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}
.hp-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.2s ease;
}
.hp-faq-answer.open { max-height: 400px; }

/* ═══════════════════════════════════════════════
   TOAST NOTIFICATIONS
══════════════════════════════════════════════════ */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

/* ═══════════════════════════════════════════════
   UTILITIES
══════════════════════════════════════════════════ */
.ds-divider { height: 1px; background: var(--border-color); }
.ds-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ds-select-none { user-select: none; }