@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap');

/*Tokens*/
:root {
  --bg:       #0d0d0d;
  --surface:  #141414;
  --border:   #262626;
  --accent:   #00ff88;
  --text:     #e0e0e0;
  --muted:    #555;
  --dim:      #888;
  --font:     'JetBrains Mono', monospace;
  --radius:   4px;
}
[data-theme="amber"] { --accent: #ffb300; }
[data-theme="cyan"]  { --accent: #00d4ff; }
[data-theme="rose"]  { --accent: #ff4d6d; }
[data-theme="violet"]{ --accent: #a855f7; }

/*Reset*/
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
}
a { color: var(--dim); text-decoration: none; }
a:hover { color: var(--accent); }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
h2 { font-size: 28px; font-weight: 700; margin-bottom: 24px; }
h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }

/*Navbar*/
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; align-items: center; gap: 32px;
  padding: 0 40px; height: 52px;
  background: rgba(13,13,13,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
  z-index: 100;
}
.logo { font-size: 15px; font-weight: 700; color: var(--accent); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 12px; }
.nav-actions { display: flex; gap: 12px; margin-left: auto; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px; font-family: var(--font); font-size: 12px;
  border-radius: var(--radius); transition: all 0.15s;
}
.btn-ghost { color: var(--dim); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--accent); border-color: var(--accent); }
.btn-primary { color: var(--bg); background: var(--accent); border: 1px solid var(--accent); font-weight: 700; }
.btn-primary:hover { opacity: 0.85; }
.btn.large { padding: 10px 22px; font-size: 13px; }

/*Hero*/
.hero {
  min-height: 100dvh; /*at least full screen tall*/
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; /* center vertically */
  text-align: center; padding: 80px 24px 48px;
  position: relative;
}
.eyebrow { font-size: 11px; letter-spacing: 0.15em; color: var(--accent); margin-bottom: 20px; }
.hero-title {
  font-size: clamp(56px, 12vw, 120px); /*vw-viewport width %*/
  font-weight: 700; line-height: 1; margin-bottom: 20px;
  position: relative; display: inline-block;
}
.hero-title .accent { color: var(--accent); }
.cursor {
  position: absolute; left: 100%; bottom: 0.14em;
  display: inline-block /*text+element behaivor*/; width: 0.5em; height: 0.08em;
  background: var(--accent); margin-left: 6px;
  animation: blink 1s step-end infinite;
}
.hero-sub { font-size: 15px; color: var(--dim); max-width: 420px; margin-bottom: 36px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap/*auto next line*/; justify-content: center; }
.scroll-hint {
  position: absolute; bottom: 32px;
  font-size: 11px; color: var(--muted); white-space: nowrap;
}

/*Sections*/
.section { max-width: 1000px; margin: 0 auto; padding: 72px 24px; }
.label { font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
.divider { border: none; border-top: 1px solid var(--border); }
.muted { color: var(--dim); font-size: 13px; }

/*Terminal*/
.terminal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.term-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 14px; background: #111; border-bottom: 1px solid var(--border);
}
.dot { width: 10px; height: 10px; border-radius: 100%; }
.dot.red    { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green  { background: #28c840; }
.term-title { flex: 1; text-align: center; font-size: 11px; color: var(--muted); }
.term-body { padding: 16px 20px; font-size: 12px; line-height: 1.9/*compared to text size*/; min-height: 120px; }
/* terminal line colours */
.t-cmd  { color: var(--accent); }
.t-acc  { color: var(--accent); }
.t-dim  { color: var(--dim); }
.t-text { color: var(--text); }
.acc    { color: var(--accent); }
.term-cursor {
  display: inline-block; width: 0.5em; height: 0.08em;
  background: var(--accent); margin-left: 3px;
  animation: blink 1s step-end infinite;
}

.term-status {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 14px; background: #111; border-top: 1px solid var(--border);
  font-size: 11px; color: var(--muted);
}
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/*Cards*/
.cards { display: grid; grid-template-columns: repeat(3, 1fr/*1/3 of display width*/); gap: 16px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--accent); }
.card-icon { font-size: 20px; margin-bottom: 12px; }
.card-tag { font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.card p { font-size: 12px; color: var(--dim); margin-bottom: 12px; }
.preview {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px 12px;
  font-size: 11px; color: var(--dim); white-space: pre; line-height: 1.8;
  overflow-x: auto/*if overflow scroll*/;
}
.accent { color: var(--accent); }

/*Theme switcher*/
.theme-radio { display: none; }
.theme-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.switch {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 14px; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 12px; color: var(--dim);
  background: var(--surface); cursor: pointer; transition: all 0.15s;
}
.switch:hover { border-color: var(--accent); color: var(--text); }
.switch-dot { width: 10px; height: 10px; border-radius: 100%; }

/*active switch when radio checked*/
#t-green:checked  ~ .theme-row label[for="t-green"],
#t-amber:checked  ~ .theme-row label[for="t-amber"],
#t-cyan:checked   ~ .theme-row label[for="t-cyan"],
#t-rose:checked   ~ .theme-row label[for="t-rose"],
#t-violet:checked ~ .theme-row label[for="t-violet"] {
  border-color: var(--switch-color, #00ff88);
  color: var(--text);
  background: var(--bg);
}
label[data-theme="green"]  { --switch-color: #00ff88; }
label[data-theme="amber"]  { --switch-color: #ffb300; }
label[data-theme="cyan"]   { --switch-color: #00d4ff; }
label[data-theme="rose"]   { --switch-color: #ff4d6d; }
label[data-theme="violet"] { --switch-color: #a855f7; }

/*theme terminal accent colour*/
.theme-display { display: none; color: var(--accent); }

#t-green:checked  ~ .theme-terminal .theme-name-green,
#t-amber:checked  ~ .theme-terminal .theme-name-amber,
#t-cyan:checked   ~ .theme-terminal .theme-name-cyan,
#t-rose:checked   ~ .theme-terminal .theme-name-rose,
#t-violet:checked ~ .theme-terminal .theme-name-violet { display: inline; }

/*theme colour overrides with sibling selectors*/
#t-amber:checked  ~ .theme-terminal { --accent: #ffb300; }
#t-cyan:checked   ~ .theme-terminal { --accent: #00d4ff; }
#t-rose:checked   ~ .theme-terminal { --accent: #ff4d6d; }
#t-violet:checked ~ .theme-terminal { --accent: #a855f7; }

.theme-terminal { max-width: 450px; margin-top: 20px; }

/*Steps*/
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  transition: border-color 0.2s;
}
.step:hover { border-color: var(--accent); }
.step-num {
  width: 34px; height: 34px; border: 1px solid var(--accent);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: var(--accent); margin-bottom: 12px;
}
.step-cmd { font-size: 13px; font-weight: 700; color: var(--accent); margin-bottom: 6px; }
.step p { font-size: 12px; color: var(--dim); }

/*ASCII Art*/
.ascii-art {
  font-family: var(--font);
  font-size: clamp(6px, 1.2vw/*1,2%*/, 11px) /*clamp-Adaptivity*/;
  line-height: 1.3;
  color: var(--border);
  white-space: pre;
  margin-bottom: 32px;
  user-select: none;
  letter-spacing: 0;
}

/*CTA*/
.cta-section {
  padding: 72px 24px; text-align: center;
  border-top: 1px solid var(--border);
}

.cta-section .muted { margin: 8px 0 24px; }
/*Footer*/
.footer {
  display: flex; align-items: center; gap: 32px;
  padding: 24px 40px; border-top: 1px solid var(--border);
  font-size: 12px; color: var(--muted);
}
.footer-links { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.footer .muted:last-child { margin-left: auto; }


/*Auth Page*/
.auth-page { display: flex; flex-direction: column; min-height: 100dvh /*Screen height*/; }

.auth-main {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 88px 24px 48px;
}

.auth-main .eyebrow { margin-bottom: 24px; }

.auth-wrap { width: 100%; max-width: 440px; }

/* hide radio inputs */
.auth-radio { display: none; }

.auth-terminal { width: 100%; }

/* ── Auth Tabs ── */
.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: #111;
}

.auth-tab {
  flex: 1; text-align: center;
  padding: 10px 16px;
  font-family: var(--font); font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  user-select: none;
}
.auth-tab:hover { color: var(--text); }

/*active tab when radio is checked*/
#tab-login:checked    ~ .terminal .auth-tabs label[for="tab-login"],
#tab-register:checked ~ .terminal .auth-tabs label[for="tab-register"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/*Auth Panels*/
.auth-panel { display: none; }

#tab-login:checked    ~ .terminal .login-panel,
#tab-register:checked ~ .terminal .register-panel { display: block; }

/*Auth Form Body*/
.auth-body { padding: 24px 24px 20px; }

.auth-comment { font-size: 11px; margin-bottom: 20px; }

.auth-form { display: flex; flex-direction: column; gap: 16px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-label {
  font-size: 11px; color: var(--dim); letter-spacing: 0.05em;
}
.form-label .t-acc { margin-right: 4px; }

.form-input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 12px;
  font-family: var(--font); font-size: 13px;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}
.form-input::placeholder { color: var(--muted); }
.form-input:focus { border-color: var(--accent); }
.form-input:-webkit-autofill,
.form-input:-webkit-autofill:hover,
.form-input:-webkit-autofill:focus,
.form-input:-webkit-autofill:active {
  -webkit-box-shadow: 0 0 0 100px var(--bg) inset;
  -webkit-text-fill-color: var(--text);
  caret-color: var(--text);
  border-color: var(--accent);
  transition: background-color 0s 5000s;
}

.auth-btn { width: 100%; justify-content: center; margin-top: 4px; padding: 10px; font-size: 13px; }

/*Switch link*/
.auth-switch {
  margin-top: 16px;
  font-size: 11px; color: var(--dim); text-align: center;
}
.auth-switch-link {
  color: var(--accent); cursor: pointer; margin-left: 4px;
  text-decoration: underline; text-underline-offset: 3px;
}
.auth-switch-link:hover { opacity: 0.8; }

/*Status bar messages*/
.auth-status-login,
.auth-status-register { display: none; }

#tab-login:checked    ~ .terminal .term-status .auth-status-login    { display: inline; }
#tab-register:checked ~ .terminal .term-status .auth-status-register { display: inline; }

/*Animations*/
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/*Responsive*/
@media (max-width: 768px) {
  /*Tablets and smaller phones*/
  .navbar { padding: 0 16px; }
  .nav-links { display: none; }
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer { flex-direction: column; gap: 12px; text-align: center; padding: 24px 16px; }
}
@media (max-width: 480px) {
  /*Small phones*/
  .steps { grid-template-columns: 1fr /*functional unit*/; }
  .hero-cta { flex-direction: column; align-items: center; }
  .cta-form { flex-direction: column; }
}