/* ===================================================
   FitTrack — Modern Fitness Tracker Dashboard
   Complete CSS Design System
   =================================================== */

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

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --primary: #3B82F6;
  --primary-dark: #2563EB;
  --primary-light: #93C5FD;
  --primary-bg: #EFF6FF;
  --accent-green: #10B981;
  --accent-green-bg: #ECFDF5;
  --accent-red: #EF4444;
  --accent-red-bg: #FEF2F2;
  --accent-orange: #F59E0B;
  --accent-orange-bg: #FFFBEB;
  --accent-purple: #8B5CF6;
  --accent-purple-bg: #F5F3FF;
  --accent-teal: #14B8A6;
  --accent-pink: #EC4899;

  /* Neutrals */
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Layout */
  --navbar-h: 64px;
  --sidebar-w: 260px;
  --sidebar-collapsed-w: 0px;

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

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

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

body {
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-800);
  background: var(--gray-50);
  overflow-x: hidden;
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

input,
textarea,
select {
  font-family: var(--font);
  outline: none;
  border: none;
}

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

/* ===================================================
   TOP NAVBAR
   =================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-h);
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 1000;
  box-shadow: var(--shadow-xs);
}

.navbar__left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.navbar__hamburger {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--gray-700);
  transition: var(--transition-fast);
}

.navbar__hamburger:hover {
  background: var(--gray-100);
}

.navbar__hamburger svg {
  width: 24px;
  height: 24px;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.navbar__logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.navbar__logo-icon svg {
  width: 20px;
  height: 20px;
}

.navbar__search {
  position: relative;
  width: 320px;
}

.navbar__search input {
  width: 100%;
  height: 40px;
  background: var(--gray-100);
  border: 1.5px solid transparent;
  border-radius: var(--radius-full);
  padding: 0 16px 0 42px;
  font-size: 13px;
  color: var(--gray-800);
  transition: var(--transition);
}

.navbar__search input::placeholder {
  color: var(--gray-400);
}

.navbar__search input:focus {
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.navbar__search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  width: 18px;
  height: 18px;
  pointer-events: none;
}

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

.navbar__icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--gray-600);
  transition: var(--transition-fast);
  position: relative;
}

.navbar__icon-btn:hover {
  background: var(--gray-100);
  color: var(--gray-800);
}

.navbar__icon-btn svg {
  width: 22px;
  height: 22px;
}

.navbar__badge {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--accent-red);
  border-radius: 50%;
  border: 2px solid var(--white);
}

.navbar__avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 14px;
  margin-left: 8px;
  cursor: pointer;
  transition: var(--transition);
}

.navbar__avatar:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

/* ===================================================
   SIDEBAR
   =================================================== */
.sidebar {
  position: fixed;
  top: var(--navbar-h);
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  background: var(--white);
  border-right: 1px solid var(--gray-200);
  padding: 24px 16px;
  z-index: 900;
  overflow-y: auto;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  transition: var(--transition);
  position: relative;
}

.sidebar__link:hover {
  background: var(--gray-100);
  color: var(--gray-800);
}

.sidebar__link.active {
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 600;
}

.sidebar__link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 24px;
  background: var(--primary);
  border-radius: 0 4px 4px 0;
}

.sidebar__link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar__section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--gray-400);
  margin: 24px 0 8px 16px;
}

.sidebar__footer {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 899;
  opacity: 0;
  transition: opacity 0.3s;
}

.sidebar-overlay.active {
  display: block;
  opacity: 1;
}