/* ============================================================
   TaskFlow — Main Stylesheet
   Clean, modern, utility-first approach.
   ============================================================ */

:root {
  --clr-bg: #0f172a;
  --clr-surface: #1e293b;
  --clr-surface2: #273347;
  --clr-border: #334155;
  --clr-text: #e2e8f0;
  --clr-text-muted: #94a3b8;
  --clr-primary: #6366f1;
  --clr-primary-hover: #4f46e5;
  --clr-danger: #ef4444;
  --clr-success: #10b981;
  --clr-warning: #f59e0b;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.35);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--clr-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Navbar ---- */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .75rem 2rem;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-primary);
  text-decoration: none;
  letter-spacing: -.5px;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.navbar-user {
  color: var(--clr-text-muted);
  font-size: .9rem;
}

/* ---- Container ---- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1.25rem;
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background .15s, color .15s, border-color .15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--clr-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--clr-primary-hover); text-decoration: none; }

.btn-outline {
  background: transparent;
  color: var(--clr-text);
  border-color: var(--clr-border);
}
.btn-outline:hover { border-color: var(--clr-primary); color: var(--clr-primary); text-decoration: none; }

.btn-lg { padding: .75rem 2rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--clr-text-muted);
  font-size: 1rem;
  padding: .2rem .4rem;
  border-radius: 4px;
  transition: color .15s, background .15s;
}
.btn-icon:hover { color: var(--clr-danger); background: rgba(239,68,68,.1); }

/* ---- Flash messages ---- */
.flash-messages { margin-bottom: 1.5rem; }
.flash {
  padding: .75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: .5rem;
  font-weight: 500;
}
.flash-success { background: rgba(16,185,129,.15); color: var(--clr-success); }
.flash-danger   { background: rgba(239,68,68,.15);  color: var(--clr-danger);  }
.flash-info     { background: rgba(99,102,241,.15); color: var(--clr-primary); }

/* ---- Hero ---- */
.hero {
  padding: 4rem 0 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 3rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  max-width: 680px;
}

.accent { color: var(--clr-primary); }

.hero-sub {
  color: var(--clr-text-muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 1rem auto 0;
}

.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.hero-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  width: 100%;
  max-width: 720px;
}

.feature-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.feature-icon { font-size: 2rem; display: block; margin-bottom: .5rem; }
.feature-card h3 { margin-bottom: .4rem; }
.feature-card p { color: var(--clr-text-muted); font-size: .9rem; }

/* ---- Auth ---- */
.auth-wrapper {
  display: flex;
  justify-content: center;
  padding: 3rem 1rem;
}

.auth-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}

.auth-card h2 { margin-bottom: 1.5rem; font-size: 1.4rem; }

.auth-switch {
  margin-top: 1rem;
  text-align: center;
  color: var(--clr-text-muted);
  font-size: .9rem;
}

/* ---- Forms ---- */
.auth-form, #form-project, #form-task {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label { font-size: .85rem; color: var(--clr-text-muted); font-weight: 600; }

input, textarea, select {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  color: var(--clr-text);
  font-size: .95rem;
  font-family: inherit;
  padding: .55rem .75rem;
  width: 100%;
  transition: border-color .15s;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--clr-primary);
}

.form-error {
  color: var(--clr-danger);
  font-size: .85rem;
}

/* ---- Dashboard ---- */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.page-header h1 { font-size: 1.6rem; }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.project-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: box-shadow .15s;
}
.project-card:hover { box-shadow: var(--shadow); }

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .5rem;
}

.project-card h3 { font-size: 1rem; margin-bottom: .4rem; }
.project-card h3 a { color: var(--clr-text); }
.project-card h3 a:hover { color: var(--clr-primary); text-decoration: none; }

.project-desc {
  color: var(--clr-text-muted);
  font-size: .85rem;
  margin-bottom: .75rem;
}

.badge {
  font-size: .75rem;
  background: var(--clr-surface2);
  color: var(--clr-text-muted);
  border-radius: 999px;
  padding: .2rem .6rem;
  display: inline-block;
}

.empty-state {
  color: var(--clr-text-muted);
  font-style: italic;
  grid-column: 1 / -1;
  padding: 3rem 0;
  text-align: center;
}

/* ---- Color picker ---- */
.color-picker {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform .1s, border-color .1s;
}
.color-swatch:hover { transform: scale(1.15); }
.color-swatch.selected { border-color: #fff; transform: scale(1.15); }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}

.modal-overlay.hidden { display: none; }

.modal {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow);
}

.modal h3 { margin-bottom: 1.25rem; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: .75rem;
  margin-top: .5rem;
}

/* ---- Kanban Board ---- */
.board-page { padding-bottom: 3rem; }

.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 768px) {
  .kanban-board { grid-template-columns: 1fr; }
}

.kanban-col {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1rem;
  min-height: 200px;
}

.kanban-col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.col-label { font-weight: 700; font-size: .95rem; }
.col-count {
  background: var(--clr-surface2);
  border-radius: 999px;
  padding: .1rem .55rem;
  font-size: .8rem;
  color: var(--clr-text-muted);
}

.kanban-cards { display: flex; flex-direction: column; gap: .75rem; }

.task-card {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: .875rem;
  border-left: 4px solid var(--clr-border);
  transition: box-shadow .15s;
}
.task-card:hover { box-shadow: var(--shadow); }
.task-card.priority-high   { border-left-color: var(--clr-danger); }
.task-card.priority-medium { border-left-color: var(--clr-warning); }
.task-card.priority-low    { border-left-color: var(--clr-success); }

.task-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .5rem;
}

.task-actions { display: flex; gap: .25rem; }

.priority-badge {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: .15rem .5rem;
  border-radius: 999px;
}
.priority-badge.priority-high   { background: rgba(239,68,68,.2);   color: var(--clr-danger); }
.priority-badge.priority-medium { background: rgba(245,158,11,.2);  color: var(--clr-warning); }
.priority-badge.priority-low    { background: rgba(16,185,129,.2);  color: var(--clr-success); }

.task-title { font-size: .95rem; font-weight: 600; margin-bottom: .35rem; }
.task-desc  { font-size: .82rem; color: var(--clr-text-muted); margin-bottom: .35rem; }
.task-due   { font-size: .8rem; color: var(--clr-text-muted); margin-bottom: .5rem; }

.task-move-buttons {
  display: flex;
  gap: .5rem;
  margin-top: .5rem;
  justify-content: flex-end;
}

.btn-move {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
  font-size: .75rem;
  padding: .2rem .55rem;
  border-radius: 4px;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.btn-move:hover { border-color: var(--clr-primary); color: var(--clr-primary); }

/* ---- Misc ---- */
.back-link {
  display: inline-block;
  font-size: .85rem;
  color: var(--clr-text-muted);
  margin-bottom: .4rem;
}
.back-link:hover { color: var(--clr-primary); text-decoration: none; }

.hidden { display: none !important; }

/* Public demo: short, readable guidance and compact mobile navigation. */
.nav-form { display: inline; margin: 0; }
.demo-notice { margin: 1.25rem 0; padding: 1rem; border: 1px solid #6366f1; border-radius: 12px; background: #1c2040; }
.demo-notice p { margin: .4rem 0 0; line-height: 1.6; }
@media (max-width: 600px) {
  .navbar { gap: .75rem; flex-wrap: wrap; }
  .navbar-links { flex-wrap: wrap; gap: .65rem; }
  .navbar-user { display: none; }
  .page-header { gap: .75rem; flex-wrap: wrap; }
  .demo-notice { font-size: .9rem; }
}