/* 
 * OTO+ Common Styles
 * Shared across all pages
 */

:root {
    /* Colors */
    --color-primary: #333333;
    /* Charcoal */
    --color-secondary: #fcfcfc;
    /* Cream/Off-white */
    --color-accent: #00afd6;
    /* Cyan (formerly Muted Gold) */
    --color-text: #555555;
    /* Dark Grey */
    --color-light-grey: #f4f4f4;
    /* Light Grey Background */
    --color-border: #e0e0e0;

    /* Typography */
    --font-heading: 'Tenor Sans', sans-serif;
    --font-body: 'Lato', 'Zen Kaku Gothic New', sans-serif;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 32px;
    --spacing-lg: 64px;
    --spacing-xl: 100px;

    /* Layout */
    --container-width: 1200px;
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-secondary);
    line-height: 1.8;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1.3;
    font-weight: 400;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

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

/* Container */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 32px;
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.4s ease;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: #fff;
}

.btn-white {
    background-color: #fff;
    color: var(--color-primary);
    border-color: #fff;
}

.btn-white:hover {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(252, 252, 252, 0.95);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    letter-spacing: 2px;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-links li a {
    font-family: var(--font-body);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    padding: 5px 0;
}

.nav-links li a:not(.btn-nav)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: #00afd6;
    /* User requested: #00afd6 */
    transition: width 0.3s ease;
}



.nav-links li a:not(.btn-nav):hover {
    color: #00afd6;
    /* User requested: #00afd6 */
}

.nav-links li a:not(.btn-nav):hover::after {
    width: 100%;
}

.nav-links li a.active {
    color: #00afd6;
}

.nav-links li a.active::after {
    width: 100%;
    background-color: #00afd6;
}

.btn-nav {
    border: 1px solid var(--color-primary);
    padding: 8px 24px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
}

.btn-nav:hover {
    background-color: var(--color-primary);
    color: #fff;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.bar {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-primary);
    margin: 6px 0;
    transition: 0.4s;
}

/* Page Header (Subpages) */
.page-header {
    height: 40vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), #f4f4f4;
    margin-top: var(--header-height);
    background-size: cover;
    background-position: center;
}

/* Sections General */
.section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

.text-center {
    text-align: center;
}

.section-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
}

.section-desc {
    font-size: 1.1rem;
    color: #777;
    margin-bottom: var(--spacing-md);
}

.section-line {
    width: 60px;
    height: 2px;
    background-color: var(--color-accent);
    margin: 0 auto;
}

/* About Section & Content Shared */
.about {
    background-color: #fff;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    font-feature-settings: "palt";
}

.about-text p {
    margin-bottom: var(--spacing-sm);
    text-align: justify;
}

.about-image .img-placeholder {
    width: 100%;
    height: 500px;
    background-color: #eee;
    object-fit: cover;
}

/* Features */
.features {
    background-color: var(--color-light-grey);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    text-align: center;
}

.feature-card {
    padding: var(--spacing-md);
    background: #fff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
}

/* Courses (Card Styles Shared) */
.courses {
    background-color: #fff;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    align-items: start;
    max-width: 800px;
    margin: 0 auto;
}

.course-card {
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    text-align: center;
    background-color: #fff;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.course-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.course-card.featured {
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    transform: scale(1.05);
    z-index: 10;
}

.course-card.featured:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.course-card.featured h4,
.course-card.featured .price {
    color: #fff;
}

.course-card.featured ul li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.course-card.featured .btn-primary {
    background-color: #fff;
    color: var(--color-primary);
}

.course-card.featured .btn-primary:hover {
    background-color: var(--color-accent);
    color: #fff;
}

.popular-tag {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-accent);
    color: #fff;
    font-size: 0.8rem;
    padding: 5px 0;
    font-family: var(--font-heading);
    letter-spacing: 1px;
}

.course-header {
    margin-bottom: var(--spacing-md);
}

.course-header h4 {
    font-size: 1.5rem;
    margin-top: 15px;
    margin-bottom: 10px;
}

.price {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-primary);
}

.price span {
    font-size: 1rem;
    color: #999;
}

.course-card.featured .price span {
    color: #ccc;
}

.course-features {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.course-features li {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-light-grey);
    font-size: 0.95rem;
}

.course-features li i {
    color: var(--color-accent);
    margin-right: 10px;
}

/* Instructor (Wrapper Shared) */
.instructor {
    background-color: var(--color-light-grey);
    padding: 0;
}

.instructor-wrapper {
    display: flex;
    flex-wrap: wrap;
    min-height: 600px;
}

.instructor-img,
.instructor-info {
    flex: 1;
    width: 50%;
}

.instructor-info {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.role {
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-heading);
}

.bio {
    line-height: 2;
    color: #666;
}

/* CTA */
.cta {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--spacing-xl) 0;
}

.cta-title {
    color: #fff;
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    margin-bottom: var(--spacing-md);
    color: #ccc;
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: #fff;
    padding: var(--spacing-lg) 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #333;
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 2rem;
}

.footer-social a {
    color: #fff;
    font-size: 1.2rem;
    margin-left: 20px;
    opacity: 0.7;
}

.footer-social a:hover {
    opacity: 1;
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    font-size: 0.8rem;
    color: #666;
}

.footer-links {
    text-align: center;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.footer-links a {
    margin: 0 10px;
    color: #999;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--color-accent);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.visible {
    opacity: 1;
    transform: translateY(0) translateX(0);
}

/* Global Responsive */
@media (max-width: 900px) {

    .about-content,
    .features-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }

    .course-card.featured {
        transform: scale(1);
    }

    .instructor-wrapper {
        flex-direction: column;
    }

    .instructor-img,
    .instructor-info {
        width: 100%;
        flex: auto;
    }

    .instructor-img {
        min-height: 400px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        background-color: #fff;
        flex-direction: column;
        justify-content: center;
        gap: 30px;
        transition: 0.4s ease;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 1002;
    }

    .nav-links.active {
        right: 0;
    }

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

    .mobile-menu-btn.active .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .mobile-menu-btn.active .bar:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .mobile-menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1001;
        opacity: 0;
        visibility: hidden;
        transition: 0.3s;
    }

    .mobile-menu-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .section-title {
        font-size: 2.5rem;
    }
}