/* ===== ROOT VARIABLES ===== */
:root {
    --deep-blue: #12355B;
    --teal: #1CA7A8;
    --light-grey: #F4F6F8;
    --dark-text: #1a1a1a;
    --light-text: #666;
    --white: #ffffff;
    --border-light: #e0e0e0;
    --shadow: 0 10px 40px rgba(18, 53, 91, 0.1);
    --shadow-hover: 0 15px 60px rgba(28, 167, 168, 0.15);
}

/* ===== GLOBAL RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--light-grey);
    overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--deep-blue);
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--deep-blue);
    margin: 2rem 0 1.5rem 0;
}

h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--deep-blue);
    margin: 1.5rem 0 1rem 0;
}

h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--deep-blue);
    margin: 1rem 0 0.5rem 0;
}

p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--light-text);
    margin-bottom: 1rem;
}

a {
    color: var(--teal);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--deep-blue);
}

/* ===== HEADER & NAVIGATION ===== */
header {
    background: linear-gradient(135deg, var(--deep-blue) 0%, #0d2642 100%);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--teal);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
}

.logo h1 {
    margin: 0;
    font-size: 1.8rem;
    color: var(--white);
}

.logo p {
    margin: 0;
    font-size: 0.75rem;
    color: var(--teal);
    text-transform: uppercase;
    letter-spacing: 2px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
}

nav a {
    color: var(--white);
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--teal);
    transition: width 0.3s ease;
}

nav a:hover {
    color: var(--teal);
}

nav a:hover::after {
    width: 100%;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, var(--deep-blue) 0%, #0d2642 50%, var(--teal) 100%);
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: rgba(28, 167, 168, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(30px); }
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    color: var(--white);
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: slideInDown 0.8s ease;
}

.hero p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    animation: slideInUp 0.8s ease 0.2s both;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: slideInUp 0.8s ease 0.4s both;
}

@keyframes slideInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--teal);
    color: var(--white);
}

.btn-primary:hover {
    background: #148788;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(28, 167, 168, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--deep-blue);
    transform: translateY(-3px);
}

.btn-outline {
    background: transparent;
    color: var(--teal);
    border: 2px solid var(--teal);
}

.btn-outline:hover {
    background: var(--teal);
    color: var(--white);
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 5rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--light-text);
}

/* ===== GRID LAYOUTS ===== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin: 2rem 0;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(240px, 1fr));
    gap: 2.5rem;
    margin: 2rem 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2.5rem;
    margin: 2rem 0;
}
.contact-layout {
    grid-template-columns: minmax(280px, 0.8fr) minmax(520px, 1.4fr);
    align-items: start;
}

.contact-form-wrap {
    width: 100%;
}

/* ===== CARDS ===== */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid var(--teal);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.card h3 {
    margin-top: 0;
}

.card p {
    margin-bottom: 1.5rem;
}

/* ===== COURSE CARDS ===== */
.course-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.course-header {
    background: linear-gradient(135deg, var(--teal), #138e8f);
    color: var(--white);
    padding: 2rem;
    min-height: 150px;
    display: flex;
    align-items: flex-end;
}

.course-header h3 {
    color: var(--white);
    margin: 0;
}

.course-body {
    padding: 2rem;
}

.course-details {
    display: flex;
    gap: 2rem;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.course-detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

/* ===== FEATURE SECTION ===== */
.features {
    background: var(--light-grey);
}

.feature-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--teal), #138e8f);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.8rem;
    flex-shrink: 0;
}

.feature-content h4 {
    margin-top: 0;
}

/* ===== TESTIMONIALS ===== */
.testimonial {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    border-left: 4px solid var(--teal);
    position: relative;
}

.testimonial::before {
    content: '"';
    position: absolute;
    top: -10px;
    left: 15px;
    font-size: 4rem;
    color: var(--teal);
    opacity: 0.3;
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 1.5rem;
    color: var(--dark-text);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--teal), #138e8f);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: bold;
}

.author-info h4 {
    margin: 0;
    font-size: 1rem;
}

.author-info p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--light-text);
}

/* ===== FORM ===== */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--deep-blue);
    font-weight: 600;
}

input, textarea, select {
    width: 100%;
    padding: 0.85rem;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(28, 167, 168, 0.1);
}

textarea {
    resize: vertical;
    min-height: 150px;
}

/* ===== FOOTER ===== */
footer {
    background: linear-gradient(135deg, var(--deep-blue) 0%, #0d2642 100%);
    color: var(--white);
    padding: 4rem 2rem 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--teal);
    margin-bottom: 1.5rem;
}

.footer-section p, .footer-section li {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.75rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-section a:hover {
    color: var(--teal);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    h3 {
        font-size: 1.3rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1.05rem;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    nav ul {
        gap: 1.5rem;
        font-size: 0.9rem;
    }

    section {
        padding: 3rem 2rem;
    }

    .grid, .grid-2, .grid-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .contact-layout {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .hero {
        padding: 4rem 1rem;
    }

    .feature-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .feature-icon {
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    nav ul {
        gap: 1rem;
        font-size: 0.8rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .header-content {
        padding: 0 1rem;
    }
}

/* ===== UTILITIES ===== */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.opacity-7 {
    opacity: 0.7;
}

.hidden {
    display: none;
}