:root {
   --primary: #2f5d50;
   --primary-dark: #24483e;
   --accent: #f0c36a;
   --bg: #f5f6f8;
   --surface: #fff;
   --text: #222;
   --muted: #666;
   --line: #e5e8e7;
   --radius: 18px;
   --shadow: 0 12px 32px rgba(0, 0, 0, .09);
   --header-h: 72px;
}

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

html {
   scroll-behavior: smooth;
}

body {
   min-height: 100vh;
   display: flex;
   flex-direction: column;
   overflow-x: hidden;
   font-family: Arial, Helvetica, sans-serif;
   color: var(--text);
   background: linear-gradient(180deg, #fafafa, #f3f5f7);
}

body.menu-open {
   overflow: hidden;
}

a {
   color: inherit;
}

button,
a {
   -webkit-tap-highlight-color: transparent;
}

.site-header {
   min-height: var(--header-h);
   display: flex;
   align-items: center;
   gap: 1rem;
   padding: .8rem clamp(1rem, 3vw, 2rem);
   background: #fff;
   border-bottom: 1px solid var(--line);
   position: relative;
   z-index: 20;
}

.menu-toggle,
.menu-close {
   width: 48px;
   height: 48px;
   flex: 0 0 48px;
   border: 0;
   border-radius: 14px;
   display: grid;
   place-items: center;
   background: rgba(47, 93, 80, .08);
   color: var(--primary);
   font-size: 1.55rem;
   cursor: pointer;
}

.menu-toggle:hover,
.menu-close:hover {
   background: rgba(47, 93, 80, .14);
}

.menu-toggle:focus-visible,
.menu-close:focus-visible,
.nav-link:focus-visible,
.button-link:focus-visible,
.timer-button:focus-visible {
   outline: 3px solid rgba(47, 93, 80, .32);
   outline-offset: 3px;
}

.brand {
   display: flex;
   align-items: center;
   gap: .75rem;
   min-width: 0;
   text-decoration: none;
}

.brand-mark {
   width: 40px;
   height: 40px;
   flex: 0 0 40px;
   border-radius: 50%;
   display: grid;
   place-items: center;
   background: rgba(240, 195, 106, .28);
   color: var(--primary);
   font-size: 1.2rem;
}

.brand-copy strong {
   display: block;
   color: var(--primary);
   font-size: 1.35rem;
}

.brand-copy span {
   display: block;
   margin-top: .1rem;
   color: var(--muted);
   font-size: .86rem;
}

.menu-overlay {
   position: fixed;
   inset: 0;
   z-index: 40;
   visibility: hidden;
   opacity: 0;
   background: rgba(20, 28, 26, .42);
   transition: opacity .22s ease, visibility .22s ease;
}

.side-menu {
   position: fixed;
   inset: 0 auto 0 0;
   z-index: 50;
   width: min(320px, 85vw);
   overflow-y: auto;
   background: #fff;
   box-shadow: 12px 0 35px rgba(0, 0, 0, .18);
   transform: translateX(-105%);
   transition: transform .25s ease;
}

.menu-overlay.is-open {
   visibility: visible;
   opacity: 1;
}

.side-menu.is-open {
   transform: translateX(0);
}

.menu-head {
   display: flex;
   align-items: center;
   justify-content: space-between;
   padding: 1rem;
   border-bottom: 1px solid var(--line);
}

.menu-head strong {
   color: var(--primary);
   font-size: 1.15rem;
}

.menu-nav {
   padding: 1rem;
}

.menu-section-title {
   margin: 1rem .65rem .5rem;
   color: var(--muted);
   font-size: .78rem;
   font-weight: 700;
   text-transform: uppercase;
   letter-spacing: .08em;
}

.nav-link,
.nav-disabled {
   display: block;
   padding: .9rem 1rem;
   border-radius: 12px;
   text-decoration: none;
   font-weight: 700;
}

.nav-link:hover {
   background: rgba(47, 93, 80, .08);
   color: var(--primary);
}

.nav-link[aria-current="page"] {
   color: var(--primary);
   background: rgba(47, 93, 80, .1);
}

.nav-disabled {
   margin-top: .35rem;
   color: #999;
   background: #f7f7f7;
}

.page-main {
   flex: 1;
   width: min(1120px, 100%);
   margin: 0 auto;
   padding: clamp(2rem, 5vw, 4.5rem) 1rem;
}

.app-intro {
   max-width: 760px;
   margin: 0 auto 2rem;
   text-align: center;
}

.eyebrow {
   margin-bottom: .7rem;
   color: var(--primary);
   font-size: .82rem;
   font-weight: 800;
   text-transform: uppercase;
   letter-spacing: .1em;
}

.app-intro h1 {
   color: var(--primary);
   font-size: clamp(2.4rem, 7vw, 4.5rem);
   line-height: 1;
}

.app-subtitle {
   max-width: 650px;
   margin: 1rem auto 0;
   color: var(--muted);
   font-size: 1.08rem;
   line-height: 1.7;
}

.timer-card {
   width: min(760px, 100%);
   margin: 0 auto;
   padding: clamp(1.25rem, 4vw, 2.5rem);
   display: grid;
   gap: clamp(1.5rem, 4vw, 2.25rem);
   background: var(--surface);
   border: 1px solid var(--line);
   border-radius: var(--radius);
   box-shadow: var(--shadow);
}

.timer-card-heading {
   display: flex;
   align-items: center;
   gap: 1rem;
}

.app-icon {
   width: 58px;
   height: 58px;
   flex: 0 0 58px;
   border-radius: 16px;
   display: grid;
   place-items: center;
   background: rgba(240, 195, 106, .25);
   font-size: 1.75rem;
}

.timer-card h2 {
   margin-bottom: .4rem;
   color: var(--primary);
}

.timer-card-heading p {
   color: var(--muted);
   line-height: 1.6;
}

.timer-display-group {
   min-width: 0;
   padding: clamp(1.25rem, 5vw, 2.5rem) clamp(.75rem, 4vw, 2rem);
   text-align: center;
   border: 1px solid rgba(47, 93, 80, .16);
   border-radius: 16px;
   background: rgba(47, 93, 80, .045);
}

.timer-label {
   display: block;
   margin-bottom: .65rem;
   color: var(--muted);
   font-size: .82rem;
   font-weight: 700;
   text-transform: uppercase;
   letter-spacing: .08em;
}

.timer-display {
   display: block;
   width: 100%;
   color: var(--primary-dark);
   font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
   font-size: clamp(2.55rem, 11vw, 6.5rem);
   font-weight: 800;
   line-height: 1;
   letter-spacing: -.06em;
   font-variant-numeric: tabular-nums;
   white-space: nowrap;
}

.timer-controls {
   display: grid;
   grid-template-columns: repeat(3, minmax(0, 1fr));
   gap: .85rem;
}

.timer-button,
.button-link {
   min-height: 52px;
   border-radius: 999px;
   font: inherit;
   font-weight: 800;
   cursor: pointer;
   transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.timer-button {
   padding: .8rem 1rem;
   border: 2px solid transparent;
}

.timer-button-primary {
   background: var(--primary);
   color: #fff;
}

.timer-button-primary:hover {
   background: var(--primary-dark);
}

.timer-button-secondary {
   border-color: var(--primary);
   background: #fff;
   color: var(--primary);
}

.timer-button-secondary:hover {
   background: rgba(47, 93, 80, .09);
}

.timer-button-neutral {
   border-color: rgba(34, 34, 34, .16);
   background: #f1f3f2;
   color: var(--text);
}

.timer-button-neutral:hover {
   border-color: rgba(47, 93, 80, .28);
   background: #e8ecea;
}

.timer-button:active,
.button-link:active,
.nav-link:active,
.menu-toggle:active,
.menu-close:active {
   transform: translateY(1px) scale(.99);
}

.button-link {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   justify-self: center;
   padding: .8rem 1.2rem;
   background: var(--primary);
   color: #fff;
   text-decoration: none;
}

.button-link:hover {
   background: var(--primary-dark);
}

.nav-link,
.menu-toggle,
.menu-close {
   transition: background-color .18s ease, color .18s ease, transform .18s ease;
}

.site-footer {
   padding: 1.5rem 1rem;
   text-align: center;
   color: #777;
}

.footer-nav {
   display: flex;
   justify-content: center;
   flex-wrap: wrap;
   gap: .75rem 1.1rem;
   margin-top: .8rem;
}

.footer-nav a {
   color: var(--primary);
   font-weight: 700;
   text-decoration: none;
}

.footer-nav a:hover {
   text-decoration: underline;
}

@media (max-width: 600px) {
   .site-header {
      gap: .75rem;
   }

   .brand-copy strong {
      font-size: 1.15rem;
   }

   .brand-copy span {
      font-size: .78rem;
   }

   .page-main {
      padding-top: 2rem;
   }

   .timer-card {
      padding: 1.25rem;
   }

   .timer-card-heading {
      align-items: flex-start;
   }

   .timer-display {
      font-size: clamp(2.4rem, 15vw, 4.5rem);
   }

   .timer-controls {
      grid-template-columns: 1fr;
   }

   .timer-button,
   .button-link {
      width: 100%;
   }

   .footer-nav {
      flex-direction: column;
   }
}

@media (max-width: 380px) {
   .timer-card-heading {
      display: grid;
   }

   .timer-display {
      font-size: clamp(2rem, 14vw, 3.1rem);
      letter-spacing: -.08em;
   }
}

@media (prefers-reduced-motion: reduce) {
   *,
   *::before,
   *::after {
      scroll-behavior: auto !important;
      animation-duration: .01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: .01ms !important;
   }
}