/* =============================================
   ECS Innovation — Notion-inspired Design System
   ============================================= */

:root {
  --bg: #ffffff;
  --bg-secondary: #f7f7f5;
  --bg-tertiary: #f1f1ef;
  --bg-hover: #ebebea;
  --text-primary: #37352f;
  --text-secondary: #6b6b6b;
  --text-tertiary: #9b9a97;
  --border: #e3e2de;
  --border-strong: #d3d1cb;
  --accent: #2eaadc;
  --accent-hover: #2496c4;
  --accent-light: rgba(46, 170, 220, 0.08);
  --red: #eb5757;
  --red-light: rgba(235, 87, 87, 0.08);
  --green: #4dab9a;
  --green-light: rgba(77, 171, 154, 0.08);
  --yellow: #dfab01;
  --yellow-light: rgba(223, 171, 1, 0.08);
  --orange: #e9730c;
  --navy: #1a2332;
  --navy-light: #243044;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif', Georgia, serif;
  --transition: 150ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* =============================================
   Navbar
   ============================================= */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.navbar-brand .logo-icon {
  width: 28px;
  height: 28px;
  background: var(--navy);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 0.75rem;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar-links a {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  font-weight: 500;
}

.navbar-links a:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.navbar-links .btn-login {
  background: var(--navy);
  color: white;
  padding: 6px 16px;
  margin-left: 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.navbar-links .btn-login:hover {
  background: var(--navy-light);
  color: white;
}

/* =============================================
   Hero
   ============================================= */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  background: var(--bg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(46, 170, 220, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(26, 35, 50, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 720px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-weight: 500;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--navy);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-primary:hover {
  background: var(--navy-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--text-tertiary);
}

/* =============================================
   Content Sections
   ============================================= */

.section {
  padding: 96px 24px;
}

.section-alt {
  background: var(--bg-secondary);
}

.container {
  max-width: 1080px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  padding: 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 20px;
}

.card-icon.blue { background: var(--accent-light); color: var(--accent); }
.card-icon.green { background: var(--green-light); color: var(--green); }
.card-icon.orange { background: var(--yellow-light); color: var(--orange); }
.card-icon.red { background: var(--red-light); color: var(--red); }

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Stats */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.stat-item {
  text-align: center;
  padding: 32px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 4px;
  font-weight: 500;
}

/* Capabilities list */
.capabilities-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
}

.capability-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg);
  transition: all var(--transition);
}

.capability-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.capability-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--navy);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
}

.capability-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.capability-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* CTA */
.cta-section {
  text-align: center;
  padding: 96px 24px;
  background: var(--navy);
  color: white;
}

.cta-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-section p {
  font-size: 1.0625rem;
  opacity: 0.8;
  max-width: 500px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: white;
  color: var(--navy);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
  padding: 48px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-weight: 700;
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* =============================================
   Login Page
   ============================================= */

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-header .logo-icon {
  width: 44px;
  height: 44px;
  background: var(--navy);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1rem;
  margin: 0 auto 16px;
}

.login-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.login-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  color: var(--text-primary);
  transition: border-color var(--transition);
  background: var(--bg);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-group input::placeholder {
  color: var(--text-tertiary);
}

.login-error {
  padding: 10px 12px;
  background: var(--red-light);
  border: 1px solid rgba(235, 87, 87, 0.2);
  border-radius: var(--radius-sm);
  color: var(--red);
  font-size: 0.8125rem;
  margin-bottom: 16px;
  display: none;
}

.login-error.visible {
  display: block;
}

.btn-login-submit {
  width: 100%;
  padding: 11px;
  background: var(--navy);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-login-submit:hover {
  background: var(--navy-light);
}

.btn-login-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.login-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.login-footer a {
  color: var(--accent);
  font-weight: 500;
}

/* =============================================
   Dashboard
   ============================================= */

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

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 50;
}

.sidebar-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.875rem;
}

.sidebar-brand .logo-icon {
  width: 24px;
  height: 24px;
  background: var(--navy);
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 0.625rem;
}

.sidebar-user {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar-user .user-info {
  overflow: hidden;
}

.sidebar-user .user-name {
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.sidebar-user .user-role {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: capitalize;
}

/* Sidebar Nav */
.sidebar-nav {
  padding: 12px 8px;
  flex: 1;
  overflow-y: auto;
}

.sidebar-section-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  padding: 8px 8px 4px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  cursor: pointer;
  font-weight: 500;
}

.sidebar-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-link.active {
  background: var(--bg-hover);
  color: var(--text-primary);
  font-weight: 600;
}

.sidebar-link .link-icon {
  font-size: 1.125rem;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 12px 8px;
  border-top: 1px solid var(--border);
}

/* Main Content */
.dashboard-main {
  flex: 1;
  margin-left: 260px;
  min-width: 0;
}

.dashboard-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.topbar-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dashboard-content {
  padding: 40px 32px;
  max-width: 960px;
}

/* Dashboard Page Header */
.page-header {
  margin-bottom: 40px;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 6px;
}

.page-header p {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* Quick Links */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
}

.quick-link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  background: var(--bg);
}

.quick-link-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.quick-link-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.quick-link-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.quick-link-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* Todo Section */
.todo-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.todo-count {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border-radius: 100px;
  color: var(--text-secondary);
}

.todo-input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.todo-input-row input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg);
  transition: border-color var(--transition);
}

.todo-input-row input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.todo-input-row input::placeholder {
  color: var(--text-tertiary);
}

.todo-input-row select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  background: var(--bg);
  cursor: pointer;
}

.btn-add-todo {
  padding: 10px 20px;
  background: var(--navy);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.btn-add-todo:hover {
  background: var(--navy-light);
}

/* Todo List */
.todo-list {
  list-style: none;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  transition: all var(--transition);
  background: var(--bg);
}

.todo-item:hover {
  border-color: var(--border-strong);
}

.todo-item.completed {
  opacity: 0.55;
}

.todo-checkbox {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-strong);
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}

.todo-checkbox:hover {
  border-color: var(--accent);
}

.todo-checkbox.checked {
  background: var(--accent);
  border-color: var(--accent);
}

.todo-checkbox.checked::after {
  content: '✓';
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
}

.todo-title {
  flex: 1;
  font-size: 0.9375rem;
  min-width: 0;
}

.todo-item.completed .todo-title {
  text-decoration: line-through;
  color: var(--text-tertiary);
}

.todo-priority {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 100px;
  flex-shrink: 0;
}

.todo-priority.high {
  background: var(--red-light);
  color: var(--red);
}

.todo-priority.medium {
  background: var(--yellow-light);
  color: var(--orange);
}

.todo-priority.low {
  background: var(--green-light);
  color: var(--green);
}

.todo-delete {
  opacity: 0;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-tertiary);
  font-size: 1rem;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.todo-item:hover .todo-delete {
  opacity: 1;
}

.todo-delete:hover {
  color: var(--red);
  background: var(--red-light);
}

.todo-empty {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-tertiary);
  font-size: 0.9375rem;
}

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

@media (max-width: 768px) {
  .navbar-links a:not(.btn-login) {
    display: none;
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .capabilities-list {
    grid-template-columns: 1fr;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .sidebar {
    display: none;
  }

  .dashboard-main {
    margin-left: 0;
  }

  .dashboard-content {
    padding: 24px 16px;
  }

  .quick-links {
    grid-template-columns: 1fr;
  }

  .todo-input-row {
    flex-direction: column;
  }
}

/* =============================================
   Animations
   ============================================= */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.5s ease forwards;
  opacity: 0;
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }
.fade-in-delay-4 { animation-delay: 0.4s; }