*{
    text-align: center;
}
:root {
    --neon-purple: #9D00FF;
    --electric-blue: #00E5FF;
    --cyan-highlight: #00BFFF;
    --dark-background: #121212;
    --light-text: #FFFFFF;
    --dark-text: #333333;
}

body {
    background-color: var(--dark-background);
    color: var(--light-text);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

img {
    max-width: 100%;
    height: auto;
}

.navbar {
    background-color: #1E1E1E;
    padding: 1rem;
    border-bottom: 1px solid var(--neon-purple);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--cyan-highlight);
    font-weight: bold;
    font-size: 1.5rem;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin-left: 20px;
}

.nav-links a {
    color: var(--light-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--cyan-highlight);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px;
    background-color: var(--light-text);
}

.hero {
    text-align: center;
    padding: 100px 20px;
    background: linear-gradient(135deg, var(--neon-purple), var(--electric-blue));
    border-radius: 15px;
    margin-bottom: 40px;
    margin-top: 20px;
}

.hero h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

.cta-button {
    background-color: var(--cyan-highlight);
    color: var(--dark-text);
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: transform 0.2s ease, background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--electric-blue);
    transform: scale(1.05);
}

.cta-button:active {
  transform: scale(0.95);
}

.cta-button-secondary {
    background-color: transparent;
    color: var(--light-text);
    border: 1px solid var(--light-text);
    padding: 10px 20px;
    margin-top: 15px;
    display: inline-block;
}

.cta-button-secondary:hover {
    background-color: var(--light-text);
    color: var(--dark-text);
}

section {
    padding: 40px 20px;
    margin-bottom: 40px;
    background-color: #1E1E1E;
    border-radius: 15px;
}

h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--cyan-highlight);
}

.steps, .features-grid, .recommendations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.step, .feature-card, .card {
    background-color: #2a2a2a;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-box {
    background-color: #1E1E1E;
    padding: 40px;
    border-radius: 15px;
    width: 350px;
    text-align: center;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

.error-message {
    color: red;
    margin-top: 10px;
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.dashboard-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.dashboard-section {
    background-color: #1E1E1E;
    padding: 20px;
    border-radius: 15px;
}

.timetable-list .free-slot {
    color: var(--cyan-highlight);
    font-weight: bold;
}

/* Weekly Schedule */
.schedule-grid-container {
    display: grid;
    grid-template-columns: 60px repeat(5, 1fr);
    gap: 5px;
}

.schedule-day, .schedule-time, .schedule-slot {
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    background-color: #2a2a2a;
}

.schedule-day, .schedule-time {
    font-weight: bold;
}

.schedule-slot.free {
    background-color: #1a2c3a;
    border: 1px solid var(--cyan-highlight);
    box-shadow: 0 0 8px var(--cyan-highlight);
    cursor: pointer;
    position: relative;
}

.schedule-slot.free .badge {
    position: absolute;
    top: 3px;
    right: 3px;
    background-color: var(--electric-blue);
    color: var(--dark-text);
    padding: 2px 4px;
    font-size: 0.6em;
    border-radius: 3px;
}

.schedule-slot .tooltip {
    visibility: hidden;
    width: 150px;
    background-color: var(--dark-background);
    color: var(--light-text);
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 110%;
    left: 50%;
    margin-left: -75px;
    opacity: 0;
    transition: opacity 0.3s;
    border: 1px solid var(--neon-purple);
}

.schedule-slot.free:hover .tooltip, .schedule-slot.free:focus .tooltip {
    visibility: visible;
    opacity: 1;
}

/* Demo Landing Page */
.demo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.demo-box {
    background-color: #1E1E1E;
    padding: 40px;
    border-radius: 15px;
    width: 450px;
    text-align: center;
    border: 1px solid var(--neon-purple);
}

.demo-box h2 {
    margin-bottom: 20px;
}

.demo-box .subtext {
    margin-bottom: 30px;
}

.demo-box .credentials {
    margin-bottom: 30px;
    text-align: left;
}

.demo-box .credentials p {
    margin: 10px 0;
}

/* Responsive Design */
@media (max-width: 1024px) { /* Tablet */
    .dashboard-main {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) { /* Mobile */
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 60px;
        left: 0;
        background-color: #1E1E1E;
        text-align: center;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        padding: 1rem 0;
    }

    .hamburger {
        display: block;
    }

    .hero h1 {
        font-size: 2.5em;
    }

    .hero {
        padding: 60px 20px;
    }

    .steps, .features-grid, .recommendations-grid {
        grid-template-columns: 1fr;
    }

    .login-box, .demo-box {
        width: 90%;
        padding: 30px;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .dashboard-header .user-info {
        margin-bottom: 20px;
    }

    .schedule-grid-container {
        grid-template-columns: 50px repeat(5, 120px);
        overflow-x: auto;
        padding-bottom: 10px;
    }
}

@media (max-width: 480px) { /* Small Mobile */
    .hero h1 {
        font-size: 2em;
    }

    .cta-button {
        padding: 12px 24px;
        font-size: 0.9em;
        min-height: 44px;
    }

    section {
        padding: 30px 15px;
    }
}

/* Animations */
.reveal {
  opacity: 0;
  transition: all 0.7s ease-out;
}

.reveal.active {
  opacity: 1;
}

.fade-up {
  transform: translateY(40px);
}

.fade-up.active {
  transform: translateY(0);
}

.fade-in {
  transform: scale(0.9);
}

.fade-in.active {
  transform: scale(1);
}

.slide-in-left {
  transform: translateX(-40px);
}

.slide-in-left.active {
  transform: translateX(0);
}

.slide-in-right {
  transform: translateX(40px);
}

.slide-in-right.active {
  transform: translateX(0);
}

.features-grid .feature-card {
  transition-delay: calc(0.1s * var(--i));
}