:root {
    --primary-blue: #0A2540; /* Navy Blue */
    --secondary-blue: #0066CC; /* Bright Blue */
    --light-blue: #E6F0FA;
    --white: #FFFFFF;
    --text-dark: #334155;
    --text-muted: #64748b;
}

* {
    padding: 0;
    margin: 0;
    font-family: 'IBM Plex Sans Thai Looped', sans-serif;
    box-sizing: border-box;
}

body {
    background: linear-gradient(135deg, var(--light-blue) 0%, #f1f6fc 100%);
    min-height: 100vh;
    color: var(--text-dark);
}

#logo_nav {
    padding-right: 5px;
}

.hero_img {
    display: block;
}

/* Navbar */
.custom-navbar {
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(10, 37, 64, 0.05);
    padding: 15px 20px;
    margin-top: 15px;
    border-bottom: none !important;
}

.nav-pills .nav-link {
    color: var(--primary-blue);
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 8px;
    margin: 0 3px;
    padding: 8px 16px;
}

.nav-pills .nav-link:hover {
    background-color: var(--light-blue);
    color: var(--secondary-blue);
    transform: translateY(-2px);
}

.nav-pills .nav-link.active {
    background: linear-gradient(135deg, var(--secondary-blue), var(--primary-blue)) !important;
    color: var(--white) !important;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

/* Hero Section */
.hero-card {
    background-color: var(--white);
    border: none !important;
    border-radius: 20px !important;
    box-shadow: 0 15px 35px rgba(10, 37, 64, 0.08) !important;
    overflow: hidden;
    position: relative;
    background: linear-gradient(to right, var(--white), #f8fbff);
}

.hero-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: linear-gradient(to bottom, var(--secondary-blue), var(--primary-blue));
}

.system-title {
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 2.4rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.highlight-text {
    color: var(--secondary-blue);
}

.institute-name {
    color: var(--secondary-blue);
    font-size: 1.4rem;
    font-weight: 500;
    opacity: 0.95;
    margin-bottom: 1.5rem;
}

.decorative-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, var(--secondary-blue), var(--primary-blue));
    border-radius: 2px;
    margin-bottom: 1.5rem;
}

.system-desc {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--text-muted);
}

.hero-logo {
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    filter: drop-shadow(0 15px 25px rgba(0,0,0,0.1));
}

.hero-logo:hover {
    transform: scale(1.05) translateY(-10px);
}

/* Custom Buttons */
.custom-btn {
    background: linear-gradient(135deg, var(--secondary-blue), var(--primary-blue));
    color: var(--white) !important;
    border: none;
    padding: 12px 28px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1.05rem;
}

.custom-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 102, 204, 0.4);
    color: var(--white) !important;
}

.custom-btn-outline {
    background: transparent;
    color: var(--primary-blue) !important;
    border: 2px solid var(--secondary-blue);
    padding: 10px 26px; /* slightly less padding due to border */
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1.05rem;
}

.custom-btn-outline:hover {
    background: var(--light-blue);
    color: var(--secondary-blue) !important;
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.15);
}

/* Animations */
.fade-in {
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media only screen and (max-width: 990px) {
  .hero-card {
      padding: 1.5rem !important;
  }
  .system-title {
      font-size: 1.8rem;
  }
  .institute-name {
      font-size: 1.2rem;
  }
}