/* =====================
   GLOBAL RESET
===================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  background-color: #f5f7fa;
  color: #1a1a1a;
  line-height: 1.6;
}

/* =====================
   NAVBAR
===================== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 3rem;
  background: #ffffff;
  border-bottom: 1px solid #eaeaea;
  position: sticky;
  top: 0;
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
}

.navbar nav a {
  margin-right: 1.5rem;
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

.navbar nav a:hover {
  color: #000;
}

.theme-btn {
  border: 1px solid #ddd;
  background: transparent;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}

/* =====================
   HERO SECTION
===================== */
.hero {
  padding: 5rem 3rem;
  text-align: center;
  background: linear-gradient(to right, #111, #333);
  color: white;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  max-width: 600px;
  margin: auto;
  opacity: 0.85;
}

/* =====================
   LOGIN SECTION
===================== */
.login-section {
  max-width: 400px;
  margin: 4rem auto;
  background: white;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  text-align: center;
}

.login-section h2 {
  margin-bottom: 0.5rem;
}

.login-form input {
  width: 100%;
  padding: 0.7rem;
  margin: 1rem 0;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.login-form button {
  width: 100%;
  padding: 0.7rem;
  background: #111;
  color: white;
  border: none;
  cursor: pointer;
}

/* =====================
   TODO SECTION
===================== */
.todo-section {
  max-width: 600px;
  margin: 5rem auto;
  padding: 0 1rem;
}

.todo-input {
  display: flex;
  margin: 1rem 0;
}

.todo-input input {
  flex: 1;
  padding: 0.7rem;
  border: 1px solid #ccc;
  border-radius: 6px 0 0 6px;
}

.todo-input button {
  padding: 0.7rem 1.2rem;
  border: none;
  background: #111;
  color: white;
  border-radius: 0 6px 6px 0;
}

.todo-list {
  list-style: none;
}

.todo-item {
  display: flex;
  justify-content: space-between;
  background: white;
  padding: 0.8rem 1rem;
  margin-bottom: 0.6rem;
  border-radius: 6px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.04);
}

/* =====================
   FEEDBACK & CONTACT
===================== */
.feedback-section,
.contact-section {
  max-width: 600px;
  margin: 5rem auto;
  padding: 0 1rem;
}

.feedback-form textarea,
.contact-form textarea,
.contact-form input {
  width: 100%;
  margin: 0.8rem 0;
  padding: 0.7rem;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.feedback-form button,
.contact-form button {
  padding: 0.7rem 1.2rem;
  background: #111;
  color: white;
  border: none;
  cursor: pointer;
}

/* =====================
   FOOTER
===================== */
.footer {
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
  border-top: 1px solid #eaeaea;
  font-size: 0.9rem;
  color: #555;
}