/* === MODERN PORTFOLIO STYLES - Redesigned === */

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

/* --- Root Variables (Light Theme - Target Image Style) --- */
:root {
    /* Palette - Based on Target Image */
    --bg-color: #F0F4F8; /* Light greyish-blue background */
    --panel-bg: #FFFFFF; /* White panel background */
    --panel-border: transparent; /* No visible border, shadow implies separation */
    --text-color: #4F4F4F; /* Dark grey for body text */
    --text-muted: #828282; /* Lighter grey for muted text / nav links */
    --heading-color: #1C1C1E; /* Near black for main headings */
    --primary-accent: #007AFF; /* Bright blue accent */
    --primary-accent-darker: #005ECB; /* Darker blue for hover */
    --primary-accent-rgb: 0, 122, 255; /* For RGBA */
    --secondary-accent: #FF9500; /* Optional: Orange (kept from original, can be changed/removed) */
    --button-text-color: #FFFFFF; /* White text for primary blue button */
    --card-bg: var(--panel-bg); /* Cards use panel background or slight off-white */
    --card-border: #E0E0E0; /* Light border for cards if needed */
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --card-hover-shadow: 0 6px 16px rgba(0, 0, 0, 0.07);
    --input-border-color: #BDBDBD;
    --input-focus-border-color: var(--primary-accent);
    --input-focus-shadow-color: rgba(var(--primary-accent-rgb), 0.15);
    --input-bg-color: #FFFFFF;
    --footer-text-color: var(--text-muted);
    --footer-link-color: var(--primary-accent);
    
    /* Tesseract Styles from Image */
    --tesseract-line-color: #000000; /* Black lines */
    --tesseract-text-color: #000000; /* Black "VN" */
    --tesseract-subtext-color: #6c757d; /* Grey subtext for tesseract */

    --preloader-bg: var(--bg-color);
    --preloader-text-color: var(--text-muted);
    --preloader-logo-color: var(--heading-color);
    --error-bg-color: #f8d7da;
    --error-text-color: #721c24;
    --error-border-color: #f5c6cb;

    /* Transitions & Timing */
    --theme-transition-duration: 0.3s;
    --hover-transition-duration: 0.2s;
    --animation-delay-step: 0.08s;

    /* Typography */
    --font-family-base: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 1rem; /* 16px */
    --line-height-base: 1.6; /* Adjusted for readability */
    --heading-font-weight: 600;
    --heading-line-height: 1.3;
    --heading-letter-spacing: 0.1px; /* Subtle spacing */
}

/* --- Dark Mode Variables (Interpretive based on new style) --- */
body.dark-mode {
    --bg-color: #1A202C; /* Dark blue-grey */
    --panel-bg: #2D3748; /* Slightly lighter dark grey for panel */
    --panel-border: transparent;
    --text-color: #E2E8F0; /* Light grey text */
    --text-muted: #A0AEC0; /* Muted grey */
    --heading-color: #FFFFFF; /* White heading */
    --primary-accent: #3B82F6; /* A slightly brighter blue for dark mode */
    --primary-accent-darker: #2563EB;
    --primary-accent-rgb: 59, 130, 246;
    --button-text-color: #FFFFFF; /* White text on blue buttons */
    --card-bg: var(--panel-bg);
    --card-border: #4A5568;
    --card-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    --card-hover-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    --input-border-color: #4A5568;
    --input-focus-border-color: var(--primary-accent);
    --input-focus-shadow-color: rgba(var(--primary-accent-rgb), 0.2);
    --input-bg-color: #4A5568;
    --footer-text-color: var(--text-muted);
    --footer-link-color: var(--primary-accent);

    /* Tesseract Dark Mode */
    --tesseract-line-color: #E0E0E0; /* Light grey lines */
    --tesseract-text-color: #FFFFFF; /* White "VN" */
    --tesseract-subtext-color: #A0AEC0; /* Lighter grey subtext */

    --preloader-bg: var(--bg-color);
    --preloader-text-color: var(--text-muted);
    --preloader-logo-color: var(--heading-color);
    --error-bg-color: #552a2f;
    --error-text-color: #f8d7da;
    --error-border-color: #a13d44;
}

/* --- Base Styles & Transitions --- */
body, input, textarea, button, select {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--theme-transition-duration) ease, color var(--theme-transition-duration) ease;
    padding: 20px; /* Add some padding to body for overall spacing from viewport edges */
}

/* Selective Transitions (Keep or adjust as needed) */
.main-container, .logo, .main-nav a, .button-primary, .project-card, .theme-toggle-btn,
.request-panel, .panel-content h3, .panel-content a, .close-panel-btn,
.modal-content, .modal-close-btn, .form-group input, .form-group textarea,
.audio-control-btn, .education-item, .site-footer-info, .skill-tag,
.graphic-content, .center-letter, .graphic-subtext, .detail-item {
    transition: background-color var(--theme-transition-duration) ease,
    color var(--theme-transition-duration) ease,
    border-color var(--theme-transition-duration) ease,
    fill var(--theme-transition-duration) ease, /* Removed 'background' as it's too broad */
    box-shadow var(--theme-transition-duration) ease, /* Kept box-shadow */
    transform var(--hover-transition-duration) ease,
    opacity var(--theme-transition-duration) ease;
}


h1, h2, h3, h4, h5, h6 {
    font-weight: var(--heading-font-weight);
    line-height: var(--heading-line-height);
    color: var(--heading-color);
    letter-spacing: var(--heading-letter-spacing);
    margin-bottom: 0.75em;
}

h2 {
    font-size: 1.8rem; /* Adjusted from image */
    font-weight: 700;
}

h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

h4 {
    font-size: 1.05rem;
    color: var(--primary-accent);
    font-weight: 500;
}

p {
    margin-bottom: 1em;
    color: var(--text-color);
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: var(--primary-accent);
    text-decoration: none;
    transition: color var(--hover-transition-duration) ease, opacity 0.2s ease;
}
a:hover {
    color: var(--primary-accent-darker);
    opacity: 0.9;
}

ul { list-style: none; padding: 0; margin: 0; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; padding: 0; }

/* --- Accessibility: Focus Styles --- */
*:focus-visible {
    outline: 3px solid rgba(var(--primary-accent-rgb), 0.5);
    outline-offset: 3px;
    box-shadow: none;
    border-radius: 6px;
}
*:focus:not(:focus-visible) { outline: none; }


/* --- Preloader (Keep structural CSS, palette handled by vars) --- */
.preloader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--preloader-bg); display: flex;
    justify-content: center; align-items: center; z-index: 1000;
    opacity: 1; transition: opacity 0.8s ease-out, background-color var(--theme-transition-duration) ease;
}
.preloader.hidden { opacity: 0; pointer-events: none; }
.preloader-content { display: flex; align-items: center; justify-content: space-between; width: 80%; max-width: 1200px; position: relative; }
.preloader-text-left { font-size: 1.2rem; color: var(--preloader-text-color); line-height: 1.6; flex-basis: 25%; text-align: left; font-weight: 300; }
.preloader-letters { display: flex; justify-content: center; align-items: center; flex-grow: 1; font-size: 10rem; font-weight: 600; color: var(--preloader-logo-color); position: relative; }
.preloader-letters .letter { opacity: 0; position: absolute; animation: fadeLetter 1s ease-in-out forwards; }
.preloader-letters .subtext { font-size: 0.8rem; font-weight: 400; color: var(--preloader-text-color); position: absolute; top: 10px; right: -50px; opacity: 0; transition: opacity 0.5s 0.3s ease, color var(--theme-transition-duration) ease; }
@keyframes fadeLetter { 0% { opacity: 0; transform: scale(0.9) translateY(10px); } 25% { opacity: 1; transform: scale(1) translateY(0); } 75% { opacity: 1; transform: scale(1) translateY(0); } 100% { opacity: 0; transform: scale(0.9) translateY(-10px); } }
#letter-c1 { animation-delay: 0s; animation-name: fadeLetter; }
#letter-b { animation-delay: 0.8s; animation-name: fadeLetter; }
#letter-c1.visible .subtext, #letter-b.visible .subtext { opacity: 1; }
.preloader-line { position: absolute; bottom: -40px; left: 0; width: 100%; height: 2px; background: linear-gradient(90deg, transparent, var(--primary-accent), transparent); opacity: 0.4; }

/* --- Page Layout --- */
.page-wrapper {
    position: relative; padding: 0; /* Removed default padding, handled by body or specific containers */
    width: 100%; display: flex; justify-content: center; align-items: center;
    opacity: 0; transition: opacity 0.5s ease-in;
}
.page-wrapper.visible { opacity: 1; }
.background-circles { display: none; } /* Kept hidden as per previous style */

.main-container {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border); /* Effectively transparent if --panel-border is transparent */
    border-radius: 24px; /* Rounded corners like the image */
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1); /* Softer, larger shadow */
    padding: 30px 40px; /* Adjusted padding */
    width: 90%;
    max-width: 1280px; /* Max width from image */
    min-height: 700px; /* Ensure enough height */
    height: auto; /* Allow content to define height */
    position: relative;
    z-index: 2;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
:root { --heading-color-rgb: 28, 28, 30; } /* Approx. for #1C1C1E */
body.dark-mode { --heading-color-rgb: 255, 255, 255; }
body.dark-mode .main-container { box-shadow: 0 15px 50px rgba(0, 0, 0, 0.25); }

/* --- Header & Navigation --- */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 25px;
    margin-bottom: 25px;
    /* border-bottom: 1px solid var(--panel-border); Remove border from image */
    gap: 20px;
    flex-wrap: nowrap; /* Prevent wrapping for this specific layout */
    flex-shrink: 0;
}

.logo {
    font-weight: 600; /* Semi-bold */
    font-size: 1.6rem; /* Prominent */
    color: var(--heading-color);
    flex-shrink: 0;
}

.main-nav {
    flex-grow: 1;
    display: flex;
    justify-content: center; /* Center navigation links */
}

.main-nav ul {
    display: flex;
    gap: 40px; /* Spacing between nav items */
    list-style: none;
    padding: 0;
    margin: 0;
}

.main-nav a {
    color: var(--text-muted); /* Lighter grey for inactive links */
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 0; /* Minimal padding */
    position: relative;
    text-decoration: none;
    background-color: transparent !important;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px; /* Position underline */
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px; /* Underline thickness */
    background-color: var(--primary-accent);
    transition: width 0.3s ease;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary-accent); /* Active/hover color */
}
.main-nav a.active::after { width: 20px; /* Fixed width for active underline */ }
.main-nav a:hover::after { width: 100%; /* Full width on hover */ }


.header-controls {
    display: flex;
    align-items: center;
    gap: 12px; /* Gap between buttons */
    flex-shrink: 0;
}

/* --- Base Button Style (Target Image) --- */
.button-primary { /* "Get in Touch" style */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-accent);
    color: var(--button-text-color) !important;
    padding: 10px 22px; /* Adjusted padding */
    border-radius: 20px; /* Pill shape */
    font-weight: 500;
    font-size: 0.9rem;
    box-shadow: 0 4px 10px rgba(var(--primary-accent-rgb), 0.2);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}
.button-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(var(--primary-accent-rgb), 0.25);
    background-color: var(--primary-accent-darker);
}
body.dark-mode .button-primary {
    color: var(--button-text-color) !important; /* Ensure text color remains as defined for dark mode buttons */
}

.button-primary .arrow { margin-left: 8px; display: inline-block; transition: transform 0.2s ease; }
.button-primary:hover .arrow { transform: translateX(3px); }

/* --- Theme Toggle Button ("BETA" button style) --- */
.theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 7px 14px; /* Smaller padding */
    border-radius: 18px; /* Pill shape */
    border: 1px solid var(--primary-accent);
    color: var(--primary-accent);
    background-color: var(--panel-bg); /* White background */
    cursor: pointer;
    font-size: 0.8rem; /* Smaller font size */
    font-weight: 500;
    line-height: 1;
    transition: background-color var(--hover-transition-duration) ease, color var(--hover-transition-duration) ease, border-color var(--hover-transition-duration) ease, transform var(--hover-transition-duration) ease;
}
.theme-toggle-btn:hover {
    background-color: color-mix(in srgb, var(--primary-accent) 10%, transparent);
    transform: translateY(-1px);
}
.theme-toggle-btn .theme-icon {
    margin-right: 6px; /* Space between icon and "BETA" */
    font-size: 0.9em; /* Slightly smaller icon */
    line-height: 1;
    display: block;
}
body.dark-mode .theme-toggle-btn {
    background-color: var(--panel-bg); /* Panel background for dark mode */
    color: var(--primary-accent);
    border-color: var(--primary-accent);
}
body.dark-mode .theme-toggle-btn:hover {
    background-color: color-mix(in srgb, var(--primary-accent) 15%, transparent);
}


/* --- Audio Control Button (Minimalist, keep functional) --- */
.audio-control-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 50%;
    border: 1px solid #E0E0E0; /* Light grey border */
    color: var(--text-muted);
    background-color: var(--panel-bg);
    width: 36px; height: 36px; /* Consistent size */
    font-size: 1rem; /* Icon size */
}
.audio-control-btn:hover {
    background-color: #f0f0f0;
    border-color: #cccccc;
    color: var(--primary-accent);
}
body.dark-mode .audio-control-btn {
    border-color: var(--card-border);
    background-color: var(--panel-bg);
}
body.dark-mode .audio-control-btn:hover {
    background-color: color-mix(in srgb, var(--panel-bg) 90%, white);
}
.audio-control-btn svg { width: 1em; height: 1em; display: block; fill: currentColor; }
.audio-control-btn .hidden { display: none; }


/* --- Content Area & Sections --- */
.content-area { flex-grow: 1; position: relative; overflow: hidden; }
.content-section {
    display: none; align-items: center; position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    opacity: 0; transition: opacity 0.6s ease-in-out;
    gap: 20px; /* Gap for home section columns */
    padding: 20px 10px;
    overflow: hidden;
}
#home-section { justify-content: space-between; }
.content-section.active { display: flex; opacity: 1; z-index: 2; }

.section-left, .section-right {
    flex-basis: 28%; /* Adjusted flex-basis */
    padding: 0 15px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.section-center {
    flex-basis: 44%; /* Adjusted flex-basis */
    display: flex; justify-content: center; align-items: center;
    position: relative; flex-shrink: 0;
}

/* Standard Layout for other sections */
.content-section-standard-layout {
    flex-direction: column; justify-content: flex-start; align-items: center;
    text-align: center; height: 100%; padding: 30px 15px; overflow-y: auto; /* Allow scroll if content overflows */
}
.content-section-standard-layout h2 { color: var(--heading-color); margin-bottom: 15px; }
.content-section-standard-layout > p { color: var(--text-muted); margin-bottom: 25px; max-width: 700px; line-height: 1.7; font-size: 0.95rem; }
.content-section-standard-layout > p a { color: var(--primary-accent); text-decoration: underline; text-underline-offset: 3px; }
.content-section-standard-layout > p a:hover { color: var(--primary-accent-darker); }

/* --- Home Section Specifics (Target Image) --- */
#home-section .section-left .label { /* "I am an" */
    display: block;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: none; /* No uppercase in image */
    letter-spacing: 0.2px;
}
#home-section .section-left p { /* "Information Technology Student..." */
    font-size: 1.7rem; /* Matches image roughly */
    font-weight: 600;
    line-height: 1.35;
    color: var(--heading-color);
    letter-spacing: 0.2px;
}
#home-section .section-right h2 { /* "Passionate about code..." */
    font-size: 1.7rem; /* Matches image roughly */
    font-weight: 600;
    line-height: 1.35;
    color: var(--heading-color);
    text-align: left; /* Image shows left align for this block */
    opacity: 1;
}

/* --- Central Graphic Area (Tesseract) --- */
.graphic-area {
    position: relative; width: 100%; height: 100%;
    min-height: 320px; display: flex; justify-content: center;
    align-items: center; overflow: visible;
}
#canvas-container {
    width: 100%; height: 100%; display: flex;
    justify-content: center; align-items: center; cursor: grab;
    /* No filter/dropshadow on canvas container from image */
    z-index: 0;
}
#canvas-container:active { cursor: grabbing; }
#tesseract-canvas { display: block; max-width: 100%; max-height: 100%; }

.graphic-content { /* Text overlay on Tesseract */
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%); text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    pointer-events: none; z-index: 1;
}
.center-letter { /* "VN" */
    font-size: 5rem; /* Large VN */
    font-weight: 700;
    color: var(--tesseract-text-color); /* Black from var */
    line-height: 1;
    margin-bottom: 6px;
    opacity: 1; /* Fully opaque */
}
.graphic-subtext { /* "Exploring the world..." */
    font-size: 0.8rem;
    color: var(--tesseract-subtext-color); /* Grey from var */
    line-height: 1.4;
    font-weight: 400; /* Regular weight */
    opacity: 1;
    max-width: 220px; /* Constrain width of subtext */
}

/* --- About, Projects, Skills, Education Sections (General Styling - Retain Structure, Adapt Palette) --- */
/* These sections were not in the provided image, so their styling will adapt to the new palette */
/* but retain their existing layout and component styles (cards, tags, etc.) */

.about-center { display: flex; flex-direction: column; align-items: center; width: 100%; max-width: 900px; }
.about-details { display: flex; justify-content: center; gap: 25px; width: 100%; flex-wrap: wrap; margin-bottom: 35px; }
.detail-item {
    flex: 1 1 280px; /* Flex grow, shrink, basis */
    max-width: 300px; text-align: left; padding: 25px;
    border: 1px solid var(--card-border); border-radius: 12px;
    background-color: var(--card-bg); box-shadow: var(--card-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.detail-item:hover { transform: translateY(-4px); box-shadow: var(--card-hover-shadow); }
.detail-item .number { display: none; }
.detail-item h3 { font-size: 1.15rem; color: var(--heading-color); margin-bottom: 8px; }
.detail-item p { font-size: 0.9rem; color: var(--text-color); line-height: 1.6; }
.resume-download-container { text-align: center; margin-top: 10px; }
.resume-download-btn { padding: 10px 22px; font-size: 0.9rem; } /* Match primary button style */


.projects-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px; width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 10px;
}
.project-card {
    display: flex; flex-direction: column; background-color: var(--card-bg);
    border-radius: 10px; border: 1px solid var(--card-border); padding: 25px;
    box-shadow: var(--card-shadow); text-decoration: none; color: inherit; text-align: left;
    transition: transform var(--hover-transition-duration) ease, box-shadow var(--hover-transition-duration) ease, border-color var(--hover-transition-duration) ease;
    position: relative; cursor: pointer; overflow: hidden;
}
.project-card:hover { transform: translateY(-5px); box-shadow: var(--card-hover-shadow); border-color: var(--primary-accent); }
.project-card h3 { color: var(--heading-color); font-size: 1.2rem; margin-bottom: 10px; }
.project-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; margin-bottom: 15px; flex-grow: 1; }
.project-card .card-link-arrow {
    color: var(--primary-accent); position: absolute; bottom: 20px; right: 20px;
    font-size: 1.5rem; opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease; transform: translateX(-8px);
}
.project-card:hover .card-link-arrow { opacity: 1; transform: translateX(0); }


.skills-categories {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px; width: 100%; max-width: 1000px; margin: 0 auto; text-align: left;
}
.skill-category h3 {
    color: var(--heading-color); font-size: 1.1rem; margin-bottom: 15px;
    border-bottom: 2px solid var(--primary-accent); padding-bottom: 6px;
    display: inline-block; width: auto; letter-spacing: 0.3px;
}
.skills-list-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
    display: inline-block; background-color: color-mix(in srgb, var(--primary-accent) 12%, transparent);
    color: var(--primary-accent); border: 1px solid color-mix(in srgb, var(--primary-accent) 25%, transparent);
    padding: 5px 12px; border-radius: 15px; /* More pill-like tags */
    font-size: 0.85rem; font-weight: 500; line-height: 1.2;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.skill-tag:hover {
    background-color: var(--primary-accent); color: var(--button-text-color);
    transform: translateY(-2px); border-color: var(--primary-accent);
}
body.dark-mode .skill-tag {
    background-color: rgba(var(--primary-accent-rgb), 0.15); color: var(--primary-accent);
    border-color: rgba(var(--primary-accent-rgb), 0.3);
}
body.dark-mode .skill-tag:hover {
    background-color: var(--primary-accent);
    color: var(--heading-color); /* Dark text on colored button if button-text-color is light */
    border-color: var(--primary-accent);
}


.education-content {
    display: flex; flex-direction: column; gap: 15px; width: 100%;
    max-width: 800px; margin: 0 auto; text-align: left;
}
.education-item {
    background-color: color-mix(in srgb, var(--panel-bg) 97%, black 3%);
    border: 1px solid var(--card-border); padding: 20px 25px; border-radius: 8px;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
body.dark-mode .education-item { background-color: color-mix(in srgb, var(--panel-bg) 97%, white 3%); }
.education-item:hover { border-color: var(--primary-accent); transform: translateY(-3px); box-shadow: var(--card-hover-shadow); }
.education-item h3 { color: var(--heading-color); font-size: 1.15rem; margin-bottom: 6px; }
.education-item p, .education-item ul { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; }
.education-item ul { list-style: none; padding-left: 0; margin-top: 8px; }
.education-item li { margin-bottom: 4px; padding-left: 18px; position: relative; font-size: 0.85rem; }
.education-item li::before {
    content: '✓'; position: absolute; left: 0; color: var(--primary-accent);
    font-weight: bold; font-size: 0.9em;
}


/* --- Modal, Panel, Footer (Palette Adaptation) --- */
.modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1050;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0s 0.3s linear;
    backdrop-filter: blur(3px) saturate(70%);
}
.modal.open { opacity: 1; visibility: visible; }
.modal-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(var(--heading-color-rgb), 0.3); cursor: pointer; }
body.dark-mode .modal-overlay { background-color: rgba(0,0,0, 0.5); }

.modal-content {
    position: relative; background: var(--panel-bg); color: var(--text-color);
    padding: 30px 40px; border-radius: 16px; /* Consistent with main panel */
    border: 1px solid var(--panel-border);
    box-shadow: 0 10px 40px rgba(var(--heading-color-rgb), 0.1);
    z-index: 1051; width: 90%; max-width: 650px; max-height: 85vh; overflow-y: auto;
    transform: scale(0.95) translateY(10px); opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease, background var(--theme-transition-duration) ease, color var(--theme-transition-duration) ease;
}
body.dark-mode .modal-content { box-shadow: 0 10px 40px rgba(0,0,0,0.2); }
.modal.open .modal-content { transform: scale(1) translateY(0); opacity: 1; }
.modal-close-btn {
    position: absolute; top: 12px; right: 15px; font-size: 2.2rem; font-weight: 300;
    color: var(--text-muted); cursor: pointer; padding: 0 5px; line-height: 1; opacity: 0.7;
    transition: opacity 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.modal-close-btn:hover { color: var(--primary-accent); opacity: 1; transform: rotate(90deg) scale(1.05); }
#project-modal-title { font-size: 1.6rem; color: var(--heading-color); margin-bottom: 20px; }
.modal-body #project-modal-image { max-width: 100%; height: auto; margin-bottom: 20px; border-radius: 8px; display: none; border: 1px solid var(--card-border); }
.modal-body #project-modal-image.visible { display: block; }
.modal-body h4 { font-size: 1.1rem; color: var(--primary-accent); margin-top: 20px; margin-bottom: 8px; }
.modal-body p { font-size: 0.9rem; color: var(--text-color); line-height: 1.6; margin-bottom: 12px; }
.modal-links { margin-top: 25px; display: flex; gap: 12px; flex-wrap: wrap; }
.modal-link-btn { padding: 8px 18px; font-size: 0.85rem; border-radius: 18px; } /* Match button style */

#request-panel {
    position: fixed; top: 0; right: 0; left: auto; width: 380px; max-width: 90%; height: 100%;
    background: var(--panel-bg); border-left: 1px solid var(--panel-border); /* May become invisible */
    box-shadow: -6px 0 30px rgba(var(--heading-color-rgb), 0.07);
    z-index: 1002; overflow-y: auto; transform: translateX(100%); visibility: hidden;
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), visibility 0s 0.4s linear, background var(--theme-transition-duration) ease;
    color: var(--text-color); display: flex; flex-direction: column; border-radius: 0;
}
body.dark-mode #request-panel { box-shadow: -6px 0 35px rgba(0,0,0,0.2); }
#request-panel.open { transform: translateX(0); visibility: visible; transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), background var(--theme-transition-duration) ease; }
#panel-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(var(--heading-color-rgb), 0.25);
    z-index: 1001; opacity: 0; visibility: hidden;
    transition: opacity 0.4s ease, visibility 0s 0.4s linear; backdrop-filter: blur(2px);
}
body.dark-mode #panel-overlay { background-color: rgba(0,0,0,0.45); }
#panel-overlay.active { opacity: 1; visibility: visible; }
#close-request-panel {
    position: absolute; top: 18px; left: 18px; font-size: 1.6rem; color: var(--text-muted);
    cursor: pointer; padding: 5px; line-height: 1; opacity: 0.7;
    transition: opacity 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
#close-request-panel:hover { color: var(--primary-accent); opacity: 1; transform: rotate(180deg) scale(1.05); }
.panel-content { padding: 60px 40px 35px; display: flex; flex-direction: column; gap: 15px; flex-grow: 1; }
.panel-content h3 { font-size: 1.5rem; color: var(--heading-color); margin-bottom: 5px; }
.panel-content .panel-intro { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 20px; }
.panel-content .contact-item { margin-bottom: 10px; }
.panel-content .contact-item strong { color: var(--heading-color); display: block; margin-bottom: 3px; font-weight: 500; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.3px; }
.panel-content .contact-item a { color: var(--primary-accent); font-size: 0.9rem; }
.panel-content .contact-item a:hover { color: var(--primary-accent-darker); text-decoration: underline; }
.panel-content .legal-text { font-size: 0.75rem; color: var(--text-muted); line-height: 1.5; margin-top: auto; padding-top: 20px; border-top: 1px solid var(--card-border); }


.audio-error {
    position: fixed; bottom: 15px; left: 50%; background-color: var(--error-bg-color);
    color: var(--error-text-color); border: 1px solid var(--error-border-color);
    padding: 10px 20px; border-radius: 6px; box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    z-index: 1010; opacity: 0; visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s 0.3s linear, background-color var(--theme-transition-duration) ease, color var(--theme-transition-duration) ease, border-color var(--theme-transition-duration) ease;
    font-size: 0.85rem; transform: translateY(10px) translateX(-50%);
}
.audio-error.visible { opacity: 1; visibility: visible; transform: translateY(0) translateX(-50%); }

#contact-form { margin-top: 25px; border-top: 1px solid var(--card-border); padding-top: 20px; }
#contact-form h4 { font-size: 1.1rem; color: var(--heading-color); margin-bottom: 18px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 5px; font-weight: 500; }
.form-group input[type="text"], .form-group input[type="email"], .form-group textarea {
    width: 100%; padding: 10px 12px; border: 1px solid var(--input-border-color);
    border-radius: 6px; background-color: var(--input-bg-color); color: var(--text-color);
    font-size: 0.9rem;
    transition: border-color 0.2s ease, background-color var(--theme-transition-duration) ease, color var(--theme-transition-duration) ease, box-shadow 0.2s ease;
}
.form-group textarea { resize: vertical; min-height: 90px; }
.form-note { font-size: 0.75rem; color: var(--text-muted); margin-top: 12px; font-style: italic; }
.form-submit-btn { border-radius: 18px; } /* Match button style */


.site-footer-info {
    padding: 18px 0 0; margin-top: 20px; text-align: center;
    font-size: 0.8rem; color: var(--footer-text-color);
    border-top: 1px solid var(--card-border); /* Lighter border */
    flex-shrink: 0;
}
.site-footer-info p { margin-bottom: 4px; }
.site-footer-info a { color: var(--footer-link-color); text-decoration: underline; text-underline-offset: 2px; }
.site-footer-info a:hover { color: var(--primary-accent-darker); }


/* --- Animation --- */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.animate-on-scroll { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.animate-on-scroll.is-visible { opacity: 1; transform: translateY(0); }


/* --- Responsive Adjustments (Review and adapt to new design) --- */
@media (max-width: 1200px) {
    .main-container { width: 95%; padding: 25px 35px; min-height: 0; /* Allow shrinking */ }
    #home-section .section-left p, #home-section .section-right h2 { font-size: 1.5rem; }
    .center-letter { font-size: 4.5rem; }
}

@media (max-width: 992px) {
    body { padding: 15px; }
    .main-container { padding: 20px 25px; border-radius: 20px; }
    .site-header { flex-wrap: wrap; border-bottom: 1px solid var(--card-border); margin-bottom: 20px; padding-bottom: 15px; }
    .logo { margin-right: auto; font-size: 1.4rem; }
    .main-nav { order: 3; width: 100%; margin-top: 10px; justify-content: space-around; }
    .main-nav ul { gap: 20px; }
    .main-nav a { font-size: 0.85rem; }
    .header-controls { order: 2; margin-left: 0; gap: 10px; }
    .button-primary { padding: 9px 18px; font-size: 0.85rem; }
    .theme-toggle-btn { padding: 6px 12px; font-size: 0.75rem; }

    .content-area { overflow: visible; }
    .content-section { position: relative; height: auto; padding: 30px 10px; flex-direction: column; }
    .section-left, .section-center, .section-right { flex-basis: auto; width: 100%; padding: 0 5px; text-align: center; margin-bottom: 30px; }
    #home-section .section-left p, #home-section .section-right h2 { text-align: center; font-size: 1.4rem; }
    #home-section .section-right h2 { margin-top: 15px; text-align: center; }
    .graphic-area { height: 280px; margin: 15px 0 30px; width: 100%; order: 0; }
    .center-letter { font-size: 4rem; }
    .graphic-subtext { font-size: 0.75rem; }

    .about-details { flex-direction: column; align-items: center; gap: 20px; }
    .detail-item { max-width: 90%; text-align: center; }
    .projects-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
    .skills-categories { grid-template-columns: 1fr 1fr; gap: 25px; }
    .education-content { max-width: 90%; gap: 15px; }
    .education-item { text-align: center; }
}

@media (max-width: 768px) {
    body { padding: 10px; }
    .main-container { padding: 15px; border-radius: 16px; }
    h2 { font-size: 1.5rem; }
    #home-section .section-left p, #home-section .section-right h2 { font-size: 1.3rem; }
    .skills-categories { grid-template-columns: 1fr; }
    .modal-content { padding: 25px 20px; }
    #project-modal-title { font-size: 1.3rem; }
    .panel-content { padding: 50px 30px 30px; }
    #request-panel { width: 320px; }
    .logo { font-size: 1.3rem; }
    .main-nav ul { gap: 15px; }
}

@media (max-width: 480px) {
    .page-wrapper { padding: 0; } /* Remove page-wrapper padding for edge-to-edge on mobile */
    body { padding: 10px; } /* Main padding on body */
    .main-container { padding: 15px 10px; border-radius: 12px; }
    .logo { font-size: 1.2rem; }
    .main-nav { margin-top: 10px; }
    .main-nav ul { gap: 10px; flex-wrap: wrap; justify-content: center; }
    .main-nav a { font-size: 0.8rem; padding: 5px; }
    .header-controls { gap: 8px; width: 100%; justify-content: space-between; margin-top: 10px; }
    .button-primary { padding: 8px 16px; font-size: 0.8rem; flex-grow: 1; }
    .theme-toggle-btn { padding: 6px 10px; font-size: 0.7rem; }
    .audio-control-btn { width: 32px; height: 32px; font-size: 0.9rem; }

    .graphic-area { height: 240px; margin-bottom: 25px; }
    .center-letter { font-size: 3.2rem; }
    .graphic-subtext { font-size: 0.7rem; }
    #request-panel { width: 100%; max-width: 100%; border-radius: 0; border-left: none; }
    .panel-content { padding: 40px 20px 20px; }
    .modal-content { width: 95%; padding: 20px 15px; }
    #project-modal-title { font-size: 1.2rem; }
    .modal-link-btn { padding: 7px 14px; font-size: 0.75rem; }

    #home-section .section-left p, #home-section .section-right h2 { font-size: 1.2rem; }
    .education-item, .detail-item, .project-card { padding: 15px; }
    .education-item h3, .detail-item h3, .project-card h3 { font-size: 1rem; }
}