/* ===== DESIGN TOKENS ===== */
:root {
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem;
  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem; --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg:             #171614;
  --color-surface:        #1c1b19;
  --color-surface-2:      #201f1d;
  --color-surface-offset: #1d1c1a;
  --color-surface-offset-2: #22211f;
  --color-surface-dynamic: #2d2c2a;
  --color-divider:        #262523;
  --color-border:         #393836;
  --color-text:           #cdccca;
  --color-text-muted:     #797876;
  --color-text-faint:     #5a5957;
  --color-text-inverse:   #2b2a28;
  --color-primary:        #4f98a3;
  --color-primary-hover:  #227f8b;
  --color-primary-active: #1a626b;
  --color-primary-highlight: #313b3b;
  --color-success:        #6daa45;
  --color-success-hover:  #4d8f25;
  --color-success-highlight: #3a4435;
  --color-error:          #d163a7;
  --color-error-hover:    #b9478f;
  --color-error-highlight: #4c3d46;
  --color-warning:        #bb653b;
  --color-warning-highlight: #564942;
  --color-orange:         #fdab43;
  --color-orange-highlight: #564b3e;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

/* ===== BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: none; text-size-adjust: none; -webkit-font-smoothing: antialiased; height: 100%; }
body {
  height: 100dvh; font-family: var(--font-body, sans-serif); font-size: var(--text-base);
  color: var(--color-text); background-color: var(--color-bg); overflow: hidden;
  display: grid; grid-template-columns: 240px 1fr; grid-template-rows: 1fr;
}
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }
a, button, [role="button"], input, select { transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
::selection { background: oklch(from var(--color-primary) l c h / 0.25); color: var(--color-text); }

/* ===== SIDEBAR ===== */
.sidebar {
  grid-row: 1 / -1;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex; flex-direction: column;
  overflow-y: auto; overscroll-behavior: contain;
  padding: var(--space-4) 0;
}
.sidebar-logo {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  margin-bottom: var(--space-4);
}
.sidebar-logo svg { color: var(--color-primary); flex-shrink: 0; }
.sidebar-logo span { font-size: var(--text-base); font-weight: 700; color: var(--color-text); letter-spacing: -0.02em; }
.nav-section-label {
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-text-faint); padding: var(--space-3) var(--space-5) var(--space-2);
}
.nav-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted);
  border-radius: 0; cursor: pointer; width: 100%; text-align: left;
  border-left: 2px solid transparent;
}
.nav-item:hover { color: var(--color-text); background: var(--color-surface-dynamic); }
.nav-item.active { color: var(--color-primary); background: var(--color-primary-highlight); border-left-color: var(--color-primary); }
.nav-item i { width: 16px; height: 16px; flex-shrink: 0; }

/* ===== MAIN LAYOUT ===== */
.main-area {
  display: flex; flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-4) var(--space-8);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: 10;
}
.topbar-title { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.02em; }
.main-content {
  flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain;
  padding: var(--space-8);
}

/* ===== VIEWS ===== */
.view { display: none; }
.view.active { display: block; }

/* ===== CARDS ===== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.card-title { font-size: var(--text-base); font-weight: 600; margin-bottom: var(--space-4); display: flex; align-items: center; gap: var(--space-2); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 500; cursor: pointer;
  border: 1px solid transparent; white-space: nowrap;
}
.btn i { width: 15px; height: 15px; flex-shrink: 0; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-success { background: var(--color-success); color: #fff; }
.btn-success:hover { background: var(--color-success-hover); }
.btn-error { background: var(--color-error); color: #fff; }
.btn-error:hover { background: var(--color-error-hover); }
.btn-ghost { background: transparent; color: var(--color-text-muted); border-color: var(--color-border); }
.btn-ghost:hover { background: var(--color-surface-dynamic); color: var(--color-text); }
.btn-sm { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-icon { padding: var(--space-2); border-radius: var(--radius-md); }
.btn-danger-ghost { background: transparent; color: var(--color-error); border-color: var(--color-error-highlight); }
.btn-danger-ghost:hover { background: var(--color-error-highlight); }

/* ===== FORMS ===== */
.form-group { display: flex; flex-direction: column; gap: var(--space-1); }
.form-label { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.form-input {
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm); color: var(--color-text); width: 100%;
}
.form-input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15); }
.form-input::placeholder { color: var(--color-text-faint); }
.form-row { display: grid; gap: var(--space-4); }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }

/* ===== CUSTOMER LIST ===== */
.customer-grid { display: grid; gap: var(--space-3); }
.customer-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); cursor: pointer;
  transition: background var(--transition-interactive), border-color var(--transition-interactive);
}
.customer-card:hover { background: var(--color-surface-dynamic); border-color: var(--color-primary); }
.customer-card.active-session { border-color: var(--color-success); background: color-mix(in oklch, var(--color-success) 6%, var(--color-surface-2)); }
.customer-info { display: flex; align-items: center; gap: var(--space-3); }
.customer-avatar {
  width: 38px; height: 38px; border-radius: var(--radius-full);
  background: var(--color-primary-highlight); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-sm); font-weight: 700; flex-shrink: 0;
}
.customer-name { font-weight: 600; font-size: var(--text-sm); }
.customer-meta { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 2px; }
.customer-actions { display: flex; gap: var(--space-2); align-items: center; }

/* ===== BADGE ===== */
.badge {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 2px var(--space-2); border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 600;
}
.badge i { width: 11px; height: 11px; }
.badge-success { background: var(--color-success-highlight); color: var(--color-success); }
.badge-warning { background: var(--color-warning-highlight); color: var(--color-warning); }
.badge-primary { background: var(--color-primary-highlight); color: var(--color-primary); }
.badge-muted { background: var(--color-surface-dynamic); color: var(--color-text-muted); }

/* ===== TIME TRACKING ===== */
.time-session {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  display: grid; grid-template-columns: 1fr 120px 120px auto;
  align-items: center; gap: var(--space-4);
}
.time-session.active { border-color: var(--color-success); background: color-mix(in oklch, var(--color-success) 6%, var(--color-surface-2)); }
.session-date { font-size: var(--text-xs); color: var(--color-text-muted); }
.session-time { font-size: var(--text-sm); font-weight: 500; font-variant-numeric: tabular-nums; }
.session-duration { font-size: var(--text-sm); font-weight: 600; color: var(--color-primary); font-variant-numeric: tabular-nums; }

/* ===== EXPENSES ===== */
.expense-item {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4);
}
.expense-amount { font-size: var(--text-base); font-weight: 700; color: var(--color-orange); font-variant-numeric: tabular-nums; }
.expense-desc { font-size: var(--text-sm); }
.expense-meta { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 2px; }

/* ===== OVERVIEW / STATS ===== */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); margin-bottom: var(--space-6); }
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.stat-label { font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-muted); margin-bottom: var(--space-2); }
.stat-value { font-size: var(--text-xl); font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat-sub { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-1); }

/* ===== OVERVIEW TABLE ===== */
.overview-table { width: 100%; border-collapse: collapse; }
.overview-table th {
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4); text-align: left;
  border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; background: var(--color-surface);
}
.overview-table td {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm); border-bottom: 1px solid var(--color-divider);
  font-variant-numeric: tabular-nums;
}
.overview-table tr:hover td { background: var(--color-surface-dynamic); }

/* ===== MODAL ===== */
.modal-backdrop {
  position: fixed; inset: 0; background: oklch(0 0 0 / 0.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; backdrop-filter: blur(4px);
  opacity: 0; pointer-events: none; transition: opacity 200ms ease;
}
.modal-backdrop.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); padding: var(--space-8);
  width: min(480px, calc(100vw - 2rem));
  box-shadow: var(--shadow-lg);
  transform: translateY(8px); transition: transform 200ms ease;
}
.modal-backdrop.open .modal { transform: translateY(0); }
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-6); }
.modal-title { font-size: var(--text-base); font-weight: 700; }
.modal-footer { display: flex; gap: var(--space-3); justify-content: flex-end; margin-top: var(--space-6); }

/* ===== DATE FILTER ===== */
.date-filter { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-6); }
.date-filter label { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* ===== CONFIG BANNER ===== */
.config-banner {
  background: var(--color-warning-highlight);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-6); font-size: var(--text-sm);
}
.config-banner i { color: var(--color-warning); flex-shrink: 0; }

/* ===== EMPTY STATE ===== */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  text-align: center; padding: var(--space-16) var(--space-8); color: var(--color-text-muted);
}
.empty-state i { width: 40px; height: 40px; margin-bottom: var(--space-4); color: var(--color-text-faint); }
.empty-state h3 { color: var(--color-text); font-size: var(--text-base); margin-bottom: var(--space-2); }
.empty-state p { max-width: 32ch; font-size: var(--text-sm); margin-bottom: var(--space-6); }

/* ===== ACTIVE SESSION BANNER ===== */
.active-session-banner {
  background: var(--color-success-highlight);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-5);
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-5); font-size: var(--text-sm); font-weight: 500;
}
.active-session-banner i { color: var(--color-success); flex-shrink: 0; }
.pulse { display: inline-block; width: 8px; height: 8px; border-radius: var(--radius-full); background: var(--color-success); animation: pulse 1.5s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(0.85); } }

/* ===== TOAST ===== */
.toast-container { position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: 200; display: flex; flex-direction: column; gap: var(--space-2); }
.toast {
  background: var(--color-surface-offset-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm); box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: var(--space-3);
  animation: slideIn 200ms ease; max-width: 320px;
}
.toast i { flex-shrink: 0; }
.toast.success i { color: var(--color-success); }
.toast.error i { color: var(--color-error); }
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* ===== SECTION HEADER ===== */
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-5); }
.section-title { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.02em; }

/* ===== DIVIDER ===== */
.divider { height: 1px; background: var(--color-divider); margin: var(--space-6) 0; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: var(--radius-full); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr !important;
    grid-template-rows: 1fr auto !important;
    height: 100dvh;
  }
  .sidebar {
    grid-row: 2 !important;
    grid-column: 1 !important;
    flex-direction: row !important;
    overflow-x: auto;
    overflow-y: hidden;
    border-right: none;
    border-top: 1px solid var(--color-border);
    padding: 0;
    min-height: unset;
    height: auto;
  }
  .sidebar-logo { display: none; }
  .nav-section-label { display: none; }
  .sidebar-nav { padding: 0; display: flex; flex-direction: row; flex: 1; }
  .nav-item {
    flex: 1;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-2);
    font-size: 0.6rem;
    border-left: none !important;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    min-width: 60px;
    justify-content: center;
    align-items: center;
    margin-bottom: 0;
  }
  .nav-item svg { width: 20px; height: 20px; }
  .nav-item.active {
    border-bottom-color: var(--color-primary);
    border-left-color: transparent !important;
  }
  .main-area {
    grid-row: 1 !important;
    grid-column: 1 !important;
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }
  .main-content { padding: var(--space-4); }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .form-row.cols-2, .form-row.cols-3 { grid-template-columns: 1fr; }
  .topbar { padding: var(--space-3) var(--space-4); }
  .filter-bar { flex-direction: column; }
  .filter-bar .form-group { width: 100%; }
  #toast-container { bottom: var(--space-4); right: var(--space-4); left: var(--space-4); }
  .toast { width: 100%; }
  .session-card-actions { flex-direction: row; align-items: center; }
  .session-card-meta { gap: var(--space-2); }
  .customers-grid { grid-template-columns: 1fr; }
}


/* ===== SESSION CARDS ===== */
.sessions-list { display: flex; flex-direction: column; gap: var(--space-3); }

.session-card {
  display: flex; align-items: flex-start; gap: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-interactive);
}
.session-card:hover { box-shadow: var(--shadow-md); }
.session-card-active {
  border-color: var(--color-success);
  background: linear-gradient(135deg, var(--color-surface) 80%, var(--color-success-highlight));
}

.session-avatar {
  width: 40px; height: 40px; border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: var(--text-xs); flex-shrink: 0;
}
.session-card-active .session-avatar {
  background: var(--color-success-highlight);
  color: var(--color-success);
}

.session-card-body { flex: 1; min-width: 0; }

.session-card-top {
  display: flex; align-items: center; gap: var(--space-2);
  flex-wrap: wrap; margin-bottom: var(--space-2);
}
.session-card-name { font-weight: 600; font-size: var(--text-sm); color: var(--color-text); }

.session-card-meta {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  font-size: var(--text-xs); color: var(--color-text-muted);
}
.session-card-meta span {
  display: flex; align-items: center; gap: var(--space-1);
}
.session-card-meta svg { width: 11px; height: 11px; flex-shrink: 0; }
.session-card-duration { color: var(--color-primary) !important; font-weight: 600; }

.session-card-notes {
  margin-top: var(--space-2);
  font-size: var(--text-xs); color: var(--color-text-muted);
  font-style: italic;
}

.session-card-actions {
  display: flex; flex-direction: column; gap: var(--space-2);
  align-items: flex-end; flex-shrink: 0;
}

@media (max-width: 768px) {
  .session-card { padding: var(--space-4); }
  .session-card-actions { flex-direction: row; align-items: center; }
  .session-card-meta { gap: var(--space-2); }
}

/* ===== LOGIN SCREEN ===== */
#login-screen {
  position: fixed; inset: 0; z-index: 999;
  background: var(--color-bg);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-4);
}
#login-screen.hidden { display: none; }
.login-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  width: min(420px, 100%);
  box-shadow: var(--shadow-lg);
}
.login-logo {
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-8); justify-content: center;
}
.login-logo svg { color: var(--color-primary); }
.login-logo span { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.02em; }
.login-title { font-size: var(--text-base); font-weight: 700; margin-bottom: var(--space-2); }
.login-sub { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-6); }
.login-error {
  background: var(--color-error-highlight); border: 1px solid var(--color-error);
  border-radius: var(--radius-md); padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm); color: var(--color-error); margin-bottom: var(--space-4);
  display: none;
}