Login Page

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

:root {
  --bg: #0f1117;
  --surface: #16181f;
  --surface2: #1e2130;
  --border: #2a2d3a;
  --text: #e2e8f0;
  --text-muted: #64748b;
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --red: #f87171;
  --green: #34d399;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Layout ── */
.auth-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}

/* Left */
.auth-left {
  background: linear-gradient(160deg, #161828 0%, #0f1117 60%, #1a1040 100%);
  border-right: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
  position: relative;
  overflow: hidden;
}

.auth-left-content {
  position: relative;
  z-index: 1;
  max-width: 380px;
}

.auth-logo-big {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  text-decoration: none;
  display: block;
  margin-bottom: 48px;
}

.auth-quote {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text);
  font-style: italic;
  margin-bottom: 16px;
  quotes: "\201C" "\201D";
}

.auth-quote::before {
  content: open-quote;
}

.auth-quote::after {
  content: close-quote;
}

.auth-cite {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.auth-left-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(
      circle at 20% 20%,
      rgba(129, 140, 248, 0.08) 0%,
      transparent 50%
    ), radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.06) 0%, transparent 50%);
}

/* Right */
.auth-right {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 32px;
  background: var(--bg);
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

.auth-header {
  margin-bottom: 28px;
}

.auth-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.auth-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* OAuth */
.oauth-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.oauth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: background .15s, border-color .15s;
}

.oauth-btn:hover {
  background: var(--surface2);
  border-color: #3a3d4a;
}

/* Divider */
.auth-divider {
  position: relative;
  text-align: center;
  margin: 20px 0;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  position: absolute;
  top: 50%;
  width: calc(50% - 18px);
  height: 1px;
  background: var(--border);
}

.auth-divider::before {
  left: 0;
}

.auth-divider::after {
  right: 0;
}

.auth-divider span {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg);
  padding: 0 8px;
}

/* Form */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.field-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.field-label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.forgot-link {
  font-size: 0.78rem;
  color: var(--accent);
  text-decoration: none;
}

.forgot-link:hover {
  color: var(--accent-hover);
}

.field-input-wrap {
  position: relative;
}

.field-input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font-size: 0.875rem;
  padding: 10px 14px;
  outline: none;
  font-family: inherit;
  transition: border-color .15s;
}

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

.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.1);
}

.field-input.invalid {
  border-color: var(--red);
}

.field-input-wrap .field-input {
  padding-right: 42px;
}

.pwd-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 4px;
  transition: color .15s;
}

.pwd-toggle:hover {
  color: var(--text);
}

.field-error {
  font-size: 0.78rem;
  color: var(--red);
  margin-top: 2px;
}

/* Remember */
.remember-row {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.remember-row input {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
}

.remember-text {
  user-select: none;
}

/* Submit */
.auth-submit {
  width: 100%;
  background: var(--accent);
  border: none;
  border-radius: 9px;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 11px;
  cursor: pointer;
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background .15s, opacity .15s;
  margin-top: 4px;
}

.auth-submit:hover {
  background: var(--accent-hover);
}

.auth-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.btn-spinner svg {
  animation: spin .8s linear infinite;
}

/* Switch */
.auth-switch {
  margin-top: 20px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.auth-switch-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.auth-switch-link:hover {
  color: var(--accent-hover);
}

/* ── Responsive ── */
@media (max-width: 700px) {
  .auth-layout {
    grid-template-columns: 1fr;
  }

  .auth-left {
    display: none;
  }
}

const form = document.getElementById("loginForm");
const emailEl = document.getElementById("email");
const pwdEl = document.getElementById("password");
const submitBtn = document.getElementById("loginSubmit");
const pwdToggle = document.getElementById("pwdToggle");

// Password visibility toggle
pwdToggle?.addEventListener("click", () => {
  const isPwd = pwdEl.type === "password";
  pwdEl.type = isPwd ? "text" : "password";
  pwdToggle.setAttribute("aria-label", isPwd ? "Hide password" : "Show password");
});

// Validation
function validateEmail(val) {
  if (!val.trim()) return "Email is required.";
  if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(val)) return "Enter a valid email address.";
  return null;
}
function validatePassword(val) {
  if (!val) return "Password is required.";
  if (val.length < 8) return "Password must be at least 8 characters.";
  return null;
}

function showError(input, errorEl, msg) {
  errorEl.textContent = msg;
  errorEl.hidden = false;
  input.classList.add("invalid");
}
function clearError(input, errorEl) {
  errorEl.hidden = true;
  input.classList.remove("invalid");
}

// Live validation on blur
emailEl?.addEventListener("blur", () => {
  const err = validateEmail(emailEl.value);
  const errEl = document.getElementById("email-error");
  err ? showError(emailEl, errEl, err) : clearError(emailEl, errEl);
});
pwdEl?.addEventListener("blur", () => {
  const err = validatePassword(pwdEl.value);
  const errEl = document.getElementById("password-error");
  err ? showError(pwdEl, errEl, err) : clearError(pwdEl, errEl);
});

// Submit
form?.addEventListener("submit", async (e) => {
  e.preventDefault();
  const emailErr = validateEmail(emailEl.value);
  const pwdErr = validatePassword(pwdEl.value);

  if (emailErr) showError(emailEl, document.getElementById("email-error"), emailErr);
  else clearError(emailEl, document.getElementById("email-error"));

  if (pwdErr) showError(pwdEl, document.getElementById("password-error"), pwdErr);
  else clearError(pwdEl, document.getElementById("password-error"));

  if (emailErr || pwdErr) return;

  // Loading state
  setLoading(true);
  await new Promise((r) => setTimeout(r, 1500));
  setLoading(false);
  // Would normally redirect here
  alert("Sign-in successful! (demo)");
});

function setLoading(on) {
  submitBtn.disabled = on;
  submitBtn.querySelector(".btn-text").hidden = on;
  submitBtn.querySelector(".btn-spinner").hidden = !on;
}

// OAuth buttons
document
  .getElementById("oauthGoogle")
  ?.addEventListener("click", () => alert("Google OAuth (demo)"));
document
  .getElementById("oauthGitHub")
  ?.addEventListener("click", () => alert("GitHub OAuth (demo)"));

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Login</title>
    <link rel="stylesheet" href="style.css" />
</head>

<body>

    <div class="auth-layout">

        <!-- Left panel (decorative) -->
        <div class="auth-left">
            <div class="auth-left-content">
                <a href="#" class="auth-logo-big">✦ StealThis</a>
                <blockquote class="auth-quote">
                    "The best UI components are the ones you didn't have to build from scratch."
                </blockquote>
                <cite class="auth-cite">— A developer, probably</cite>
                <div class="auth-left-pattern" aria-hidden="true">
                    <div class="dot-grid"></div>
                </div>
            </div>
        </div>

        <!-- Right panel (form) -->
        <div class="auth-right">
            <div class="auth-card">

                <div class="auth-header">
                    <h1 class="auth-title">Welcome back</h1>
                    <p class="auth-subtitle">Sign in to your account to continue.</p>
                </div>

                <!-- OAuth buttons -->
                <div class="oauth-group">
                    <button type="button" class="oauth-btn" id="oauthGoogle">
                        <svg width="18" height="18" viewBox="0 0 24 24" fill="none">
                            <path
                                d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
                                fill="#4285F4" />
                            <path
                                d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
                                fill="#34A853" />
                            <path
                                d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l3.66-2.84z"
                                fill="#FBBC05" />
                            <path
                                d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
                                fill="#EA4335" />
                        </svg>
                        Continue with Google
                    </button>
                    <button type="button" class="oauth-btn" id="oauthGitHub">
                        <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
                            <path
                                d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.531 1.032 1.531 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0 1 12 6.844a9.59 9.59 0 0 1 2.504.337c1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.02 10.02 0 0 0 22 12.017C22 6.484 17.522 2 12 2z" />
                        </svg>
                        Continue with GitHub
                    </button>
                </div>

                <div class="auth-divider"><span>or</span></div>

                <!-- Login form -->
                <form id="loginForm" class="auth-form" novalidate>

                    <div class="field">
                        <label for="email" class="field-label">Email address</label>
                        <input type="email" id="email" name="email" class="field-input" placeholder="you@example.com"
                            autocomplete="email" />
                        <p class="field-error" id="email-error" role="alert" hidden></p>
                    </div>

                    <div class="field">
                        <div class="field-label-row">
                            <label for="password" class="field-label">Password</label>
                            <a href="#" class="forgot-link">Forgot password?</a>
                        </div>
                        <div class="field-input-wrap">
                            <input type="password" id="password" name="password" class="field-input"
                                placeholder="••••••••" autocomplete="current-password" />
                            <button type="button" class="pwd-toggle" aria-label="Toggle password visibility"
                                id="pwdToggle">
                                <svg class="eye-icon" width="16" height="16" viewBox="0 0 24 24" fill="none"
                                    stroke="currentColor" stroke-width="2">
                                    <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z" />
                                    <circle cx="12" cy="12" r="3" />
                                </svg>
                            </button>
                        </div>
                        <p class="field-error" id="password-error" role="alert" hidden></p>
                    </div>

                    <label class="remember-row">
                        <input type="checkbox" id="remember" name="remember" />
                        <span class="remember-text">Remember me for 30 days</span>
                    </label>

                    <button type="submit" class="auth-submit" id="loginSubmit">
                        <span class="btn-text">Sign in</span>
                        <span class="btn-spinner" hidden>
                            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor"
                                stroke-width="2.5">
                                <path d="M21 12a9 9 0 1 1-6.219-8.56" />
                            </svg>
                        </span>
                    </button>

                </form>

                <p class="auth-switch">
                    Don't have an account? <a href="#" class="auth-switch-link">Create account</a>
                </p>

            </div>
        </div>

    </div>

    <script src="script.js"></script>
</body>

</html>