/* ============================
   ROOT VARIABLES (LIGHT MODE)
============================ */
:root {
    --bg-gradient-start: #f3f4f6; /* Neutral light gray */
    --bg-gradient-end: #e5e7eb; /* Slightly darker gray */
    --text-color: #1f2937; /* Neutral dark gray */
    --accent-color: #3b82f6; /* Softer blue */
    --card-bg-light: #e0e7ff; /* Light mode: Slightly darker blue-gray for the cards */
    --card-border: #d1d5db; /* Light gray border */
    --card-shadow: rgba(0, 0, 0, 0.05);
    --section-bg: #f3f4f6; /* Light gray for the section */

    --header-bg-light: linear-gradient(135deg, #6a11cb, #2575fc); /* Restore original vibrant gradient */
    --footer-bg-light: #3b82f6; /* Vibrant blue for light mode */

    --header-text: #fff;
    --section-alt-bg: #eee;

    --link: #0066cc;
    --link-hover: #004999;

    --chatbot-bg-light: #f9fafb; /* Restore light gray for chatbot in light mode */

    /* Typography variables for dynamic calculations */
    --cert-title-font-size: 1.4rem;
    --cert-title-line-height: 1.2;
    --cert-title-lines: 2; /* Number of lines to reserve */

    /* Compatibility aliases for code using old variable names */
    --card-bg: var(--card-bg-light);
    --text: var(--text-color);
    --header-bg: var(--header-bg-light);
    --accent-color-hover: #2563eb; /* Darker blue for hover */

    /* Fallbacks for older browsers */
    --bg-gradient-start-fallback: #f3f4f6;
    --bg-gradient-end-fallback: #e5e7eb;
    --header-bg-light-fallback: #6a11cb;
}

/* ============================
   DARK MODE
============================ */
[data-theme="dark"] {
    --bg-gradient-start: #1e293b; /* Dark blue-gray */
    --bg-gradient-end: #111827; /* Very dark gray */
    --text-color: #e5e7eb; /* Light gray */
    --accent-color: #60a5fa; /* Softer blue */
    --card-bg-dark: #2c3e50; /* Dark mode: Darker gray-blue for the cards */
    --card-border: #374151; /* Darker gray border */
    --card-shadow: rgba(0, 0, 0, 0.2);
    --section-bg: #1e293b; /* Dark blue-gray for the section */

    --header-bg-dark: #000; /* Restore original dark mode header */
    --footer-bg-dark: #1e293b; /* Darker blue-gray for footer in dark mode */

    --chatbot-bg-dark: #0f1729; /* Proper dark gray for chatbot in dark mode */

    /* Compatibility aliases for code using old variable names */
    --card-bg: var(--card-bg-dark);
    --text: var(--text-color);
    --header-bg: var(--header-bg-dark);
    --accent-color-hover: #3b82f6; /* Brighter blue for hover in dark mode */

    /* Fallbacks for older browsers */
    --bg-gradient-start-fallback: #1e293b;
    --bg-gradient-end-fallback: #111827;
    --header-bg-dark-fallback: #000;
}

/* ============================
   GENERAL STYLES
============================ */
body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-color);
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

a {
    color: var(--link);
    text-decoration: none;
}
a:hover {
    color: var(--link-hover);
}

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

h1, h2, h3 {
    margin-top: 0;
}

/* ============================
   HEADER
============================ */
header {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-color);
    background: var(--header-bg-light);
    box-shadow: 0 4px 6px var(--card-shadow);
    border-bottom: 4px solid var(--bg-gradient-end);
}

[data-theme="dark"] header {
    background: var(--header-bg-dark);
}

header .top-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
}

header h1 {
    font-size: 3rem;
    margin: 0.5rem 0;
    color: var(--header-text);
}

header p {
    font-size: 1.2rem;
    margin: 0;
    color: #e0f2fe;
}

header nav a {
    color: var(--header-text);
    margin: 0 15px;
    font-weight: bold;
}
header nav a:hover {
    opacity: 0.8;
}

.top-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 999;
}

.lang-switch button.active {
    background: var(--link);
    color: #fff;
    border-color: var(--link);
    font-weight: bold;
    border-radius: 20px;
}

.lang-switch button {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 4px 10px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--text);
    transition: background 0.2s ease, color 0.2s ease;
}

.lang-switch button:hover {
    background: var(--link-hover);
    color: var(--header-bg);
}

.theme-toggle {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 6px 10px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text);
    transition: background 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
    background: var(--link-hover);
    color: var(--header-bg);
}

/* ============================
   SECTIONS
============================ */
.section {
    padding: 3rem 1rem;
    margin: 2rem 0;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 4px 8px var(--card-shadow);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.section.alt {
    background: var(--section-alt-bg);
    transition: background 0.3s ease;
}

/* ============================
   IFRAME WRAPPER
============================ */
.iframe-wrapper {
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(0,0,0,0.15);
}

/* ============================
   CERTIFICATES
============================ */
.cert-category {
    margin-bottom: 40px;
}

.cert-category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

/* ============================
   CERTIFICATE ITEM LAYOUT
============================ */
.cert-item {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
    background: var(--card-bg-light);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cert-item img {
    width: 100%;
    height: auto;
    border-radius: 10px;
}

.cert-item .cert-description {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.cert-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.cert-title {
    grid-row: 1;
    grid-column: 1 / 3;
    font-size: var(--cert-title-font-size);
    font-weight: bold;
    margin-bottom: 10px;
    line-height: var(--cert-title-line-height);
    min-height: calc(var(--cert-title-font-size) * var(--cert-title-lines)); /* Reserve space for multiple lines */
    display: flex;
    align-items: center;
}

.cert-image {
    width: 100%;
    height: auto;
    max-width: 100%;
    border-radius: 8px;
}

.cert-description {
    grid-row: 2;
    grid-column: 2;
    margin: 0;
    line-height: 1.5;
}

.cert-verify {
    grid-row: 3;
    grid-column: 1 / -1; /* Span across all columns */
    margin-top: 10px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.85;
}

/* ============================
   DARK MODE CARD TEXT FIX
============================ */
[data-theme="dark"] .cert-item {
    background: var(--card-bg-dark);
    color: var(--text-color);
}

[data-theme="dark"] .cert-item a {
    color: var(--accent-color);
}

[data-theme="dark"] .cert-item a:hover {
    color: var(--accent-color-hover);
}

/* ============================
   LINKS SECTION
============================ */
.about-links a {
    color: var(--link);
    text-decoration: none;
    opacity: 0.9;
}

.about-links a:hover {
    color: var(--link-hover);
    opacity: 1;
}

.about-links ul {
    max-width: 100%;
    list-style: none;
    padding: 0;
    margin: 20px 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.about-links li {
    margin: 0;
}

.about-links {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

/* ============================
   BUTTONS
============================ */
button {
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 25px;
    padding: 0.5rem 1.5rem;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
    background-color: var(--accent-color-hover);
    transform: scale(1.05);
}

/* ============================
   FOOTER
============================ */
footer {
    text-align: center;
    padding: 1.5rem;
    background: var(--footer-bg-light);
    color: #fff;
    border-top: 4px solid var(--bg-gradient-start);
}

[data-theme="dark"] footer {
    background: var(--footer-bg-dark);
}

/* ============================
   CHATBOT BACKGROUND
============================ */
.chatbot,
#chatbot {
    background: var(--chatbot-bg-light);
    transition: background 0.3s ease;
}

[data-theme="dark"] .chatbot,
[data-theme="dark"] #chatbot {
    background: var(--chatbot-bg-dark);
}

/* ============================
   TYPOGRAPHY HIERARCHY
   (see earlier h1–h3 definitions)
============================ */
p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 1rem;
}

small {
    font-size: 0.875rem;
    color: var(--text-color);
    opacity: 0.7;
}

/* ============================
   RESPONSIVE DESIGN
============================ */
@media (min-width: 768px) {
    .container {
        max-width: 1200px;
        margin: 0 auto;
    }
}

/* ============================
   RESPONSIVE DESIGN ENHANCEMENTS
============================ */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .cert-category-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    header h1 {
        font-size: 2.5rem;
    }

    p {
        font-size: 1rem;
    }
}

/* Responsive design for smaller screens */
@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    header p {
        font-size: 1rem;
    }

    .social-links {
        flex-wrap: wrap; /* Allow wrapping for smaller screens */
        gap: 10px; /* Reduce gap between items */
    }

    .social-links a {
        padding: 2px 6px; /* Adjust padding for smaller buttons */
    }

    .cert-category-grid {
        grid-template-columns: 1fr; /* Single column layout */
        gap: 10px;
    }

    section {
        padding: 2rem 1rem; /* Reduce padding for sections */
    }
}

/* ============================
   SCROLL ANIMATIONS
============================ */
section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Disable animations if user prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
    section {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* Fallback: make sections visible if JS doesn't load */
.no-js section {
    opacity: 1;
    transform: none;
}

/* ============================
   SOCIAL LINKS
============================ */
.social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    list-style: none;
    padding: 0;
    margin: 0 auto;
    text-align: center;
    flex-wrap: nowrap; /* Prevent wrapping */
    max-width: 100%; /* Ensure the container doesn't exceed the viewport */
    overflow: visible;
}

.social-links.single-row {
    flex-wrap: nowrap;
    justify-content: space-evenly;
}

.social-links li {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: visible; /* Ensure content is not clipped */
}

.social-links a {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.2s, color 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    white-space: nowrap; /* Prevent text wrapping */
    overflow: visible; /* Ensure content is not clipped */
    border-radius: 12px; /* Add rounded corners */
    padding: 4px 8px; /* Add padding for better hover effect */
}

.social-links a:hover {
    transform: scale(1.1);
    color: var(--accent-color);
    background-color: var(--card-bg-light); /* Lighter background for light mode */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .social-links a:hover {
    background-color: #374151; /* Darker background for dark mode */
}

.social-links img {
    width: 24px;
    height: 24px;
}

.social-icon {
    display: inline-block;
    width: 24px;
    height: 24px;
    background-color: currentColor;
    margin-right: 0.4rem;
}

.social-icon-github {
    -webkit-mask: url('/assets/img/github-icon.svg') no-repeat center / contain;
    mask: url('/assets/img/github-icon.svg') no-repeat center / contain;
}

.social-icon-linkedin {
    -webkit-mask: url('/assets/img/linkedin-icon.svg') no-repeat center / contain;
    mask: url('/assets/img/linkedin-icon.svg') no-repeat center / contain;
}

.social-icon-email {
    -webkit-mask: url('/assets/img/email-icon.svg') no-repeat center / contain;
    mask: url('/assets/img/email-icon.svg') no-repeat center / contain;
}

.social-icon-huggingface {
    -webkit-mask: url('/assets/img/huggingface-icon.svg') no-repeat center / contain;
    mask: url('/assets/img/huggingface-icon.svg') no-repeat center / contain;
}

.social-label-nowrap {
    white-space: nowrap;
}