/* ===========================================
   0xSpends — Design System
   Vercel-inspired B&W Minimalism
   =========================================== */

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

/* ── CSS Custom Properties ── */
:root {
  /* Colors */
  --color-bg:          #000;
  --color-bg-elevated: #0a0a0a;
  --color-bg-card:     #111;
  --color-bg-hover:    #1a1a1a;
  --color-bg-input:    #111;
  --color-surface:     #161616;

  --color-border:      #222;
  --color-border-hover:#333;

  --color-text:        #ededed;
  --color-text-secondary: #888;
  --color-text-muted:  #555;
  --color-text-heading:#fff;

  --color-white:       #fff;
  --color-black:       #000;

  /* Status colors — very subtle */
  --color-success:     #0070f3;
  --color-success-bg:  rgba(0, 112, 243, 0.08);
  --color-warning:     #f5a623;
  --color-warning-bg:  rgba(245, 166, 35, 0.08);
  --color-danger:      #e00;
  --color-danger-bg:   rgba(238, 0, 0, 0.08);
  --color-accent:      #0070f3;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;
  --text-4xl:  2.5rem;
  --text-5xl:  3.5rem;
  --text-6xl:  4.5rem;

  /* Spacing */
  --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;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg:  0 8px 30px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 40px rgba(255,255,255,0.03);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --sidebar-width: 260px;
  --navbar-height: 64px;
  --max-width: 1200px;
}

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

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

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-heading);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-5xl); font-weight: 800; letter-spacing: -0.04em; }
h2 { font-size: var(--text-3xl); font-weight: 700; letter-spacing: -0.03em; }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.text-gradient {
  background: linear-gradient(180deg, #fff 0%, #888 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  line-height: 1;
}

.btn-primary {
  background: var(--color-white);
  color: var(--color-black);
}
.btn-primary:hover {
  background: #e0e0e0;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255,255,255,0.1);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  padding: 0.5rem 0.75rem;
}
.btn-ghost:hover {
  color: var(--color-text);
  background: var(--color-bg-hover);
}

.btn-danger {
  background: transparent;
  color: var(--color-danger);
  border: 1px solid rgba(238, 0, 0, 0.3);
}
.btn-danger:hover {
  background: var(--color-danger-bg);
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--text-xs);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ── Inputs ── */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.input-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
}

.input::placeholder {
  color: var(--color-text-muted);
}

.input:focus {
  border-color: var(--color-white);
  box-shadow: 0 0 0 1px var(--color-white);
}

.input:hover:not(:focus) {
  border-color: var(--color-border-hover);
}

select.input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23888' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

/* ── Cards ── */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

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

.card-glass {
  background: rgba(17, 17, 17, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.06);
}

/* ── Navigation (Landing) ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  z-index: 100;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-logo {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-logo svg {
  width: 24px;
  height: 24px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-white);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

/* ── Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  background: var(--color-bg-elevated);
}

.badge-active {
  color: var(--color-success);
  border-color: rgba(0, 112, 243, 0.3);
  background: var(--color-success-bg);
}

.badge-warning {
  color: var(--color-warning);
  border-color: rgba(245, 166, 35, 0.3);
  background: var(--color-warning-bg);
}

.badge-danger {
  color: var(--color-danger);
  border-color: rgba(238, 0, 0, 0.3);
  background: var(--color-danger-bg);
}

/* ── Table ── */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background: var(--color-bg-elevated);
}

th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-border);
}

td {
  padding: var(--space-4);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

tr:last-child td {
  border-bottom: none;
}

tbody tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: var(--color-bg-hover);
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  width: 90%;
  max-width: 480px;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.modal-header h3 {
  font-size: var(--text-lg);
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

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

.divider-text {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.divider-text::before,
.divider-text::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fade-in   { animation: fadeIn 0.6s ease forwards; }
.animate-slide-up  { animation: slideUp 0.6s ease forwards; }
.animate-slide-down { animation: slideDown 0.4s ease forwards; }
.animate-scale-in  { animation: scaleIn 0.4s ease forwards; }

.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }

/* ── Utilities ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.text-center { text-align: center; }
.text-right  { text-align: right; }

.w-full { width: 100%; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2.5rem;
    --text-4xl: 2rem;
    --text-3xl: 1.5rem;
  }

  .container {
    padding: 0 var(--space-4);
  }

  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav-actions .btn-secondary {
    display: none;
  }
}

@media (max-width: 480px) {
  :root {
    --text-5xl: 2rem;
    --text-4xl: 1.75rem;
  }
}