/* Reset و Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #8C0202;
    --primary-dark: #6a0101;
    --secondary-color: #333333;
    --light-color: #ffffff;
    --dark-color: #000000;
    --gray-light: #f5f5f5;
    --gray: #cccccc;
    --gray-dark: #666666;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--secondary-color);
    background-color: var(--light-color);
    padding-top: 70px;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--light-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 70px;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-img {
    height: 50px;
    width: auto;
}

.logo-text h1 {
    font-size: 20px;
    color: var(--primary-color);
    font-weight: 700;
}

.logo-text p {
    font-size: 12px;
    color: var(--gray-dark);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s;
    padding: 5px 0;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

/* Hero Section */
.hero-section {
    width: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
    position: relative;
}

.hero-desktop-img,
.hero-mobile-img {
    width: 100%;
    height: auto;
    display: block;
}

.conference-info {
    background-color: var(--light-color);
    padding: 80px 0;
    position: relative;
    z-index: 2;
}

.conference-info-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

.conference-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.3;
    text-transform: uppercase;
}

.conference-year {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 800;
    letter-spacing: 3px;
}

.conference-location-date {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.conference-location-date i {
    color: var(--primary-color);
    margin-right: 8px;
}

.separator {
    color: var(--gray);
    font-weight: 300;
}

.conference-tagline {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 40px;
    font-weight: 600;
    font-style: italic;
    padding: 0 20px;
}

.conference-actions {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.btn-register {
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-register:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    color: var(--light-color);
}

.btn-agenda {
    background-color: transparent;
    color: var(--primary-color);
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--primary-color);
}

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

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

/* Countdown Section */
.countdown-section {
    background-color: var(--gray-light);
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 50px;
    font-weight: 700;
    text-transform: uppercase;
}

.countdown-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
}

.countdown-box {
    background-color: var(--light-color);
    border-radius: 10px;
    padding: 30px 20px;
    text-align: center;
    min-width: 150px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.countdown-number {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.countdown-label {
    font-size: 1.2rem;
    color: var(--secondary-color);
    font-weight: 500;
    text-transform: uppercase;
}

/* About Section */
.about-section {
    padding: 80px 0;
    background-color: var(--light-color);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 20px;
    color: var(--gray-dark);
}

/* Speakers Section */
.speakers-section {
    padding: 80px 0;
    background-color: var(--gray-light);
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.speaker-card {
    background-color: var(--light-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.speaker-card:hover {
    transform: translateY(-10px);
}

.speaker-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.speaker-info {
    padding: 20px;
    text-align: center;
}

.speaker-name {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 600;
}

.speaker-title {
    font-size: 1rem;
    color: var(--gray-dark);
    margin-bottom: 10px;
}

.speaker-country {
    font-size: 0.9rem;
    color: var(--secondary-color);
    font-weight: 500;
}

/* Registration Form */
.registration-section {
    padding: 100px 0 80px;
    background-color: var(--gray-light);
    min-height: calc(100vh - 70px);
}

.page-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.page-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--gray-dark);
    margin-bottom: 50px;
}

.registration-form-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--light-color);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.registration-form {
    padding-right: 30px;
    border-right: 1px solid var(--gray);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--secondary-color);
    font-size: 1rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--gray);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox-group input {
    width: auto;
}

.checkbox-group label {
    margin-bottom: 0;
    font-weight: normal;
}

.btn-submit {
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-submit:hover {
    background-color: var(--primary-dark);
}

.form-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
    text-align: center;
    font-weight: 500;
}

.form-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.registration-info {
    padding-left: 30px;
}

.registration-info h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.registration-info p {
    margin-bottom: 15px;
    color: var(--gray-dark);
}

.registration-info ul {
    list-style-position: inside;
    margin-bottom: 30px;
    color: var(--gray-dark);
}

.registration-info li {
    margin-bottom: 10px;
}

.contact-box {
    background-color: var(--gray-light);
    padding: 20px;
    border-radius: 5px;
    margin-top: 30px;
}

.contact-box h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Attendees Section */
.attendees-section {
    padding: 100px 0 80px;
    background-color: var(--gray-light);
    min-height: calc(100vh - 70px);
}

.attendees-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.attendee-card {
    background-color: var(--light-color);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.attendee-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 20px;
    border: 3px solid var(--primary-color);
}

.attendee-name {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.attendee-details {
    color: var(--gray-dark);
    margin-bottom: 10px;
}

.attendee-details strong {
    color: var(--secondary-color);
}

/* Footer */
.footer {
    background-color: var(--secondary-color);
    color: var(--light-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-logo-img {
    height: 60px;
    margin-bottom: 20px;
}

.footer-logo h3 {
    font-size: 1.3rem;
    color: var(--light-color);
    margin-bottom: 10px;
}

.footer-contact h4,
.footer-social h4 {
    color: var(--light-color);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-contact p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: var(--light-color);
    border-radius: 50%;
    text-decoration: none;
    transition: background-color 0.3s;
}

.social-icon:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--gray-dark);
    color: var(--gray);
}

/* Responsive */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }

    .hero-desktop-img {
        display: none;
    }

    .hero-mobile-img {
        display: block;
        width: 100%;
        height: auto;
    }

    .conference-info {
        padding: 30px 0;
        margin-top: 0;
    }

    .conference-title {
        font-size: 1.8rem;
        padding: 0 15px;
    }

    .conference-year {
        font-size: 2.5rem;
    }

    .conference-location-date {
        font-size: 1.1rem;
        flex-direction: column;
        gap: 5px;
    }

    .conference-tagline {
        font-size: 1.4rem;
        padding: 0 15px;
    }

    .btn-register {
        padding: 12px 25px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-mobile-img {
        width: 100%;
        height: auto;
    }

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

    .conference-year {
        font-size: 2rem;
    }

    .conference-tagline {
        font-size: 1.2rem;
    }
}