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

:root {
    /* White & Cyan theme */
    --primary-color: #00bcd4;        /* cyan */
    --secondary-color: #007b9e;      /* darker cyan */
    --accent-color: #00e5ff;         /* bright cyan accent */
    --text-color: #072635;           /* dark navy for readability */
    --light-bg: #ffffff;             /* white background */
    --dark-bg: #003b46;              /* deep teal for footer contrast */
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
    --light-accent: #e6fbff;         /* pale cyan for highlights */
    --jewel-teal: #006478;          /* supporting deep cyan */
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-family: 'Vazirmatn', 'Tahoma', sans-serif;
    color: var(--text-color);
    background-color: var(--light-bg);
    line-height: 1.6;
    direction: rtl;
}

/* ==================== NAVBAR ==================== */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--jewel-teal) 100%);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

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

.navbar-left {
    display: flex;
    gap: 1rem;
    align-items: center;
    /* place auth block visually at the end (left in RTL) by using a higher order */
    order: 3;
    min-width: 180px;
}

.auth-btn {
    padding: 0.7rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
}

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

.signin-btn:hover {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

.signup-btn:hover {
    background-color: var(--light-accent);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 188, 212, 0.28);
}

.navbar-center {
    flex: 1;
    text-align: center;
    order: 2;
}

.logo {
    font-size: 1.8rem;
    color: #e1e1e1;
    font-weight: bold;
    letter-spacing: 3px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Navigation Menu */
.navbar-menu {
    /* place main navigation visually at the start (right in RTL) by using a lower order */
    order: 1;
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    color: var(--light-accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
    display: inline-block;
    position: relative;
}

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

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

.nav-links a:hover::after {
    width: 100%;
}

.navbar-hamburger {
    display: none;
    order: 4;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    gap: 6px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--secondary-color);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

.mobile-menu {
    display: none;
    background-color: rgba(13, 31, 23, 0.95);
    /* align mobile menu items to the right side for RTL layout */
    padding: 1rem 2rem;
    text-align: right;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu ul {
    list-style: none;
}

.mobile-menu ul li {
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(0, 188, 212, 0.12);
}

.mobile-menu ul li a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.mobile-menu ul li a:hover {
    color: var(--light-accent);
}

/* ==================== HERO SECTION ==================== */
.hero {
    position: relative;
    height: 600px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* soft cyan overlay */
    background: linear-gradient(135deg, rgba(0, 188, 212, 0.85) 0%, rgba(0, 188, 212, 0.08) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    width: 90%;
    max-width: 1000px;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 3rem;
    font-weight: bold;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.5);
    line-height: 1.4;
    color: var(--light-bg);
}

.cta-container {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-box {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 10px;
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
    border: 2px solid var(--secondary-color);
}

.cta-box:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 32px rgba(0, 188, 212, 0.28);
    border-color: var(--accent-color);
}

.cta-box h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

/* Make the CTA toggle look like the boxes but keyboard-accessible */
.cta-toggle {
    background: transparent;
    border: none;
    padding: 0.25rem 0;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
    font-weight: 700;
}

.cta-text {
    font-size: 1.15rem;
}

.cta-toggle .chev {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-color);
    transition: transform 0.35s ease;
}

.cta-toggle.open .chev {
    transform: rotate(180deg);
}

/* Expandable inline panel */
.cta-expand {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s ease, padding 0.3s ease;
    background: rgba(230, 251, 255, 0.95);
    border-radius: 8px;
    margin: 1rem auto 0 auto;
    border: 1px solid rgba(0,188,212,0.12);
    width: 90%;
}

.cta-expand.open {
    padding: 1rem 1.5rem;
    max-height: 1000px; /* sufficiently large to show content */
}

.cta-expand-inner {
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.45s ease 0.05s, transform 0.45s ease 0.05s;
}

.cta-expand.open .cta-expand-inner {
    opacity: 1;
    transform: translateY(0);
}

.cta-expand-inner p {
    color: var(--text-color);
    line-height: 1.8;
    margin-bottom: 1rem;
    text-align: justify;
}

.cta-actions {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.cta-link {
    display: inline-block;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    background: transparent;
    color: var(--secondary-color);
    text-decoration: none;
    border: 1px solid rgba(0,188,212,0.12);
}

.cta-box p {
    color: var(--text-color);
    font-size: 0.95rem;
}

.join-box h3 {
    color: var(--accent-color);
}

.read-box h3 {
    color: var(--secondary-color);
}

/* ==================== MODALS ==================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.read-modal-content {
    max-width: 700px;
}

.modal h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.close {
    float: left;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: var(--text-color);
    transition: all 0.3s ease;
}

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

/* ==================== FORMS ==================== */
.signup-form,
.login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.signup-form input,
.login-form input,
.signup-form textarea,
.login-form textarea {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.signup-form input:focus,
.login-form input:focus,
.signup-form textarea:focus,
.login-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 8px rgba(0, 188, 212, 0.12);
}

.submit-btn {
    padding: 0.8rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--jewel-teal) 100%);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.login-form p,
.signup-form p {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-color);
}

.login-form a,
.signup-form a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
}

.login-form a:hover,
.signup-form a:hover {
    text-decoration: underline;
}

/* ==================== READ CONTENT ==================== */
.read-content {
    max-height: 600px;
    overflow-y: auto;
    padding-right: 1rem;
}

.read-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-color);
    text-align: justify;
}

.read-content p:first-child {
    font-weight: 600;
    color: var(--primary-color);
}

/* ==================== COURSES SECTION ==================== */
.courses {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--light-bg) 0%, #f5f3f0 100%);
}

/* Extra content area to lengthen page */
.more-content {
    padding: 3.5rem 2rem 6rem 2rem;
    background: linear-gradient(180deg, #ffffff 0%, #f7feff 100%);
}

.more-content h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.25rem;
}

.more-content p {
    max-width: 900px;
    margin: 0.6rem auto;
    color: var(--text-color);
    line-height: 1.8;
    text-align: justify;
}

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

.courses h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-shadow: 2px 2px 4px rgba(0, 188, 212, 0.12);
}

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

.course-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 100, 120, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid var(--secondary-color);
}

.course-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 12px 30px rgba(0, 100, 120, 0.12);
    border-left-color: var(--accent-color);
}

.course-image {
    width: 100%;
    height: 200px;
    background-size: cover;
    background-position: center;
    background-color: #ddd;
}

.course-card h3 {
    color: var(--primary-color);
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.3rem;
}

.course-summary {
    padding: 0 1.5rem;
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.6;
}

.course-btn {
    display: block;
    width: calc(100% - 3rem);
    margin: 1.5rem;
    padding: 0.8rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--jewel-teal) 100%);
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.course-btn:hover {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--light-accent) 100%);
    color: var(--primary-color);
    transform: scale(1.02);
    box-shadow: 0 8px 16px rgba(0, 188, 212, 0.22);
}

/* ==================== FOOTER ==================== */
.footer {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
    color: var(--light-bg);
    padding: 2rem;
    text-align: center;
    border-top: 3px solid var(--secondary-color);
}

.footer p {
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--light-bg);
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-color);
    transform: scale(1.2);
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }

    .navbar-hamburger {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .navbar-left {
        display: none;
    }

    .navbar-left.active {
        display: flex;
        position: absolute;
        top: 70px;
        right: 20px;
        flex-direction: column;
        background: rgba(13, 31, 23, 0.95);
        padding: 1rem;
        border-radius: 5px;
    }

    .hero-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }

    .cta-container {
        flex-direction: column;
        gap: 1rem;
    }

    .cta-box {
        min-width: auto;
        max-width: 100%;
    }

    .courses h2 {
        font-size: 2rem;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        padding: 1.5rem;
        width: 95%;
    }
}

@media (max-width: 480px) {
    .navbar-container {
        padding: 0 1rem;
    }

    .navbar-left {
        min-width: auto;
        gap: 0.5rem;
    }

    .auth-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .logo {
        font-size: 1.4rem;
        letter-spacing: 2px;
    }

    .nav-links {
        gap: 1rem;
    }

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

    .cta-container {
        gap: 0.5rem;
    }

    .cta-box {
        padding: 1.5rem;
    }

    .cta-box h3 {
        font-size: 1.1rem;
    }

    .courses h2 {
        font-size: 1.5rem;
    }

    .modal-content {
        padding: 1rem;
    }

    .close {
        font-size: 1.5rem;
    }
}

/* ==================== SCROLLBAR STYLING ==================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}