/* =========================
   BASE RESET
========================= */

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

/* =========================
   THEME ROOTS
   (ONLY SOURCE OF TRUTH)
========================= */

html[data-theme="main"] {
    --font-family: Arial, sans-serif;

    --text-color: #ffffff;
    --bg-color: #0a0a0a;

    /* background system */
    --bg-gradient: linear-gradient(120deg, #0a0a0a, #002244);
    --bg-image: none;

    /* header */
    --header-bg: #1a1a1a;

    /* nav */
    --nav-bg: transparent;
    --nav-text: #ffffff;
    --nav-hover: #003366;

    --nav-active: #003366;
    --nav-active-color: white;
    --nav-active-border: none;
    --nav-active-box-shadow: none;
    --nav-active-text-shadow: none;

    /* buttons */
    --btn-bg: #003366;
    --btn-text: #ffffff;

    /* cards */
    --card-bg: #111;
    --card-text: #fff;

    /* effects */
    --blur: none;
    --shadow: none;
    --radius: 4px;

    --nav-transition: background-color 0.3s ease;

    --tab-bg: transparent;
    --tab-border: none;
    --tab-shadow: none;
    --tab-box: none;
    --tab-transition: none;

    --lang-hover: #660300;
    --lang-hover-color: white;

    --tab-content-background: transparent;
    --tab-content-backdrop: none;

    --tab-content-border: none;
    --tab-content-radius: 0;
    --tab-content-shadow: none;

    --footer-bg: #1a1a1a;
    --footer-text: white;

    --footer-padding: 10px;

    --footer-backdrop: none;

    --footer-border: none;
    --footer-shadow: none;
    --cursor-color: #ffffff;
    --terminal-prefix-color: #00ff00;

    --home-bg: #111;
    --home-text: #fff;

    --home-h1-color: #fff;
    --home-h1-shadow: none;

    --home-p-color: #ccc;
    --home-intro-color: #bbb;

    --home-button-bg: #003366;
    --home-button-hover: #002244;

    --span-color: #015ebb;
    --span-hover-color: #6485a4;
    --span-hover-shadow: 0 0 5px #4d6c89, 0 0 10px #4d6c89, 0 0 15px #4d6c89;

    --span-font: 'JetBrains Mono', monospace;

    --img-border: transparent;
    --img-hover-border: #003366;
    --img-hover-glow: 0 0 10px #003366;

    --section-bg: #111;
    --section-text: #fff;
    --section-title: #fff;

    --exp-title: #003366;
    --exp-card-bg: #1a1a1a;
    --exp-card-text: #fff;
    --exp-subtext: #bbb;

    --exp-border: none;
    --exp-shadow: none;
    --exp-card-hover-shadow: none;

    --exp-image-border: none;
    --exp-image-shadow: none;

    --project-card-bg: #1a1a1a;
    --project-card-border: none;
    --project-card-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);

    --project-title: #fff;
    --project-text: #bbb;

    --project-accent: #003366;
    --project-button-bg: #003366;
    --project-button-hover: #002244;

    --about-bg: #1a1a1a;
    --about-box-bg: #222;

    --about-text: #bbb;
    --about-text-strong: #fff;

    --about-title: #003366;

    --about-border: 4px solid #003366;
    --about-image-glow: 0 0 15px rgba(0, 51, 102, 0.6);

    --about-container-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);

    --about-item-bg: rgba(255, 255, 255, 0.1);
    --about-item-text: #bbb;

    --contact-bg: #1a1a1a;
    --contact-border: none;
    --contact-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);

    --input-bg: #222;
    --input-text: #fff;
    --input-border: #444;

    --label-text: #fff;

    --btn-bg: #003366;
    --btn-hover: #002244;
    --btn-text: #fff;

    --popup-bg: #333;
    --popup-text: #fff;
    --popup-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);

    --social-color: #eee;
    --social-hover: #003366;
    --social-bg: transparent;
    --social-border: none;
    --social-shadow: none;

    --bg: #111;
    --text: #fff;
    --muted: #bbb;

    --card-bg: #1a1a1a;
    --card-border: none;
    --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);

    --accent: #003366;

    --glass-bg: none;
    --glass-border: none;
    --glass-blur: none;

    --mobile-menu-bg: #1a1a1a;
    --mobile-menu-border: none;
    --mobile-menu-shadow: none;

    --loader-bg: #0a0a0a;
}

html[data-theme="frutiger"] {
    --font-family: "Segoe UI", Arial, sans-serif;

    --text-color: #1a1a1a;
    --bg-color: #50bfff;

    --bg-gradient: none;
    --bg-image:
        radial-gradient(circle at top right, #99ffff 0%, transparent 40%),
        radial-gradient(circle at bottom left, rgba(179, 255, 179, 0.6) 0%, transparent 55%);

    --header-bg: rgba(255, 255, 255, 0.5);

    --nav-bg: rgba(255, 255, 255, 0.4);
    --nav-text: #003366;
    --nav-hover: rgba(255, 255, 255, 0.7);

    --nav-active: linear-gradient(180deg, #0077dd, #004c99);
    --nav-active-color: white;
    --nav-active-border: 1px solid #003366;
    --nav-active-box-shadow: inset 0 1px 5px rgba(0, 0, 0, 0.5);
    --nav-active-text-shadow: 0 1px 1px rgba(0, 0, 0, 0.3);

    --btn-bg: linear-gradient(180deg, #66b2ff, #0055aa);
    --btn-text: #ffffff;

    --card-bg: rgba(255, 255, 255, 0.6);
    --card-text: #1a1a1a;

    --blur: blur(10px);
    --shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    --radius: 8px;

    --nav-transition: all 0.2s ease;

    --tab-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(200, 220, 255, 0.6));
    --tab-border: 1px solid rgba(0, 51, 102, 0.4);
    --tab-shadow: 0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
    --tab-box: 0 1px 3px rgba(0, 0, 0, 0.1), inset 0 0 5px rgba(0, 0, 0, 0.1);
    --tab-transition: translateY(1px);

    --lang-hover: #ffaa00;
    --lang-hover-color: #1a1a1a;

    --tab-content-background: rgba(255, 255, 255, 0.4);
    --tab-content-backdrop: blur(12px);

    --tab-content-border: 1px solid rgba(255, 255, 255, 0.6);
    --tab-content-radius: 15px;

    --tab-content-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

    --footer-bg: rgba(255, 255, 255, 0.5);
    --footer-text: #1a1a1a;

    --footer-padding: 10px;

    --footer-backdrop: blur(10px);

    --footer-border: 1px solid rgba(255, 255, 255, 0.8);
    --footer-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
    --cursor-color: #0055aa;
    --terminal-prefix-color: #6a0dad;

    --home-bg: transparent;
    --home-text: #1a1a1a;

    --home-h1-color: #003366;
    --home-h1-shadow: 1px 1px 0 rgba(255, 255, 255, 0.5);

    --home-p-color: #333;
    --home-intro-color: #525252;

    --home-button-bg: #003366;
    --home-button-hover: #002244;

    --span-color: #0055aa;
    --span-hover-color: #0077ff;
    --span-hover-shadow: 0 0 5px #0077ff, 0 0 10px rgba(0, 119, 255, 0.5);

    --span-font: Arial, sans-serif;

    --section-bg: transparent;
    --section-text: #1a1a1a;
    --section-title: #003366;

    --exp-title: #0055aa;
    --exp-card-bg: rgba(255, 255, 255, 0.75);
    --exp-card-text: #003366;
    --exp-subtext: #333;

    --exp-border: 1px solid rgba(0, 51, 102, 0.3);
    --exp-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --exp-card-hover-shadow: 0 6px 12px rgba(0, 51, 102, 0.2);

    --exp-image-border: 3px solid rgba(102, 178, 255, 0.5);
    --exp-image-shadow: 0 0 5px rgba(0, 0, 0, 0.1);

    --project-card-bg: rgba(255, 255, 255, 0.6);
    --project-card-border: 1px solid rgba(255, 255, 255, 0.9);
    --project-card-shadow: 0 4px 15px rgba(0, 51, 102, 0.15);

    --project-title: #0055aa;
    --project-text: #333;

    --project-accent: #66b2ff;

    --project-button-bg: linear-gradient(180deg, #66b2ff, #0055aa);
    --project-button-hover: linear-gradient(180deg, #0055aa, #66b2ff);

    --about-bg: rgba(255, 255, 255, 0.4);
    --about-box-bg: rgba(255, 255, 255, 0.75);

    --about-text: #333;
    --about-text-strong: #1a1a1a;

    --about-title: #0055aa;

    --about-border: 4px solid #66b2ff;
    --about-image-glow: 0 0 10px rgba(102, 178, 255, 0.35);

    --about-container-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

    --about-item-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(240, 240, 240, 0.8), rgba(200, 200, 200, 0.7));
    --about-item-text: #1a1a1a;

    --contact-bg: rgba(255, 255, 255, 0.7);
    --contact-border: 1px solid rgba(255, 255, 255, 0.9);
    --contact-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);

    --input-bg: white;
    --input-text: #1a1a1a;
    --input-border: #ccc;

    --label-text: #1a1a1a;

    --btn-bg: linear-gradient(180deg, #66b2ff, #0055aa);
    --btn-hover: linear-gradient(180deg, #0055aa, #66b2ff);
    --btn-text: #fff;

    --popup-bg: rgba(255, 255, 255, 0.9);
    --popup-text: #1a1a1a;
    --popup-shadow: 0 4px 12px rgba(0, 51, 102, 0.2);

    --social-color: #0055aa;
    --social-hover: #003366;

    --social-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(200, 200, 200, 0.7));
    --social-bg-hover: linear-gradient(180deg, rgba(200, 200, 200, 0.7), rgba(255, 255, 255, 0.9));

    --social-border: 1px solid rgba(0, 51, 102, 0.3);
    --social-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    --social-shadow-hover: 0 1px 3px rgba(0, 0, 0, 0.2);

    --bg: #c5e1ff;
    --text: #1a1a1a;
    --muted: #333;

    --card-bg: rgba(255, 255, 255, 0.6);
    --card-border: 1px solid rgba(255, 255, 255, 0.8);
    --card-shadow: 0 4px 15px rgba(0, 51, 102, 0.15);

    --accent: #0055aa;

    --glass-bg: rgba(255, 255, 255, 0.4);
    --glass-border: 1px solid rgba(255, 255, 255, 0.7);
    --glass-blur: blur(12px);

    --mobile-menu-bg: rgba(255, 255, 255, 0.85);
    --mobile-menu-border: 2px solid #0055aa;
    --mobile-menu-shadow: 0 10px 20px rgba(0, 51, 102, 0.2);

    --loader-bg: #c5e1ff;
}

/* =========================
   GLOBAL BASE
========================= */

body {
    font-family: var(--font-family);
    color: var(--text-color);

    background-color: var(--bg-color);

    display: flex;
    flex-direction: column;
    min-height: 100vh;

    position: relative;
    overflow-x: hidden;

    transition:
        background-color 0.6s ease,
        color 0.4s ease;
}

body::before {
    content: "";

    position: fixed;
    inset: 0;

    background:
        linear-gradient(120deg, #0a0a0a, #002244);

    background-size: cover;
    background-attachment: fixed;

    z-index: -2;

    opacity: 1;

    transition: opacity 0.8s ease;
}

body::after {
    content: "";

    position: fixed;
    inset: 0;

    background:
        radial-gradient(circle at top right,
            #99ffff 0%,
            transparent 40%),
        radial-gradient(circle at bottom left,
            rgba(179, 255, 179, 0.6) 0%,
            transparent 55%);

    background-color: #50bfff;

    background-size: cover;
    background-attachment: fixed;

    z-index: -1;

    opacity: 0;

    transition: opacity 0.8s ease;
}

html[data-theme="frutiger"] body::before {
    opacity: 0;
}

html[data-theme="frutiger"] body::after {
    opacity: 1;
    filter: saturate(1.1) brightness(1.02);
}

header,
nav,
footer,
.tab-content,
.project-card,
.about-box,
.experience-box,
.education-box,
#contact-form,
.tabs li a,
button,
.social-icon {
    transition:
        background 0.4s ease,
        background-color 0.4s ease,
        color 0.3s ease,
        border-color 0.4s ease,
        box-shadow 0.4s ease;
}

/* =========================
   LAYOUT COMPONENTS
   (EMPTY HOOKS ONLY)
========================= */

header {
    background: var(--header-bg);
    backdrop-filter: var(--blur);

    padding: 10px 0;
    text-align: center;
    position: relative;
    z-index: 10;
}

nav {
    background: var(--nav-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    position: relative;
}

.tabs {
    list-style: none;
    display: flex;
    gap: 20px;
}

.tabs li {
    margin: 0 20px;
}

.tabs li a {
    color: var(--nav-text);

    text-decoration: none;
    font-size: 18px;
    padding: 10px 20px;
    display: inline-block;
    border-radius: var(--radius);

    transition: var(--nav-transition);


    background: var(--tab-bg);
    border: var(--tab-border);
    box-shadow: var(--tab-shadow);
}

.tabs li a:hover {
    background: var(--nav-hover);

    box-shadow: var(--tab-box);
    transform: var(--tab-transition);
}

.tabs li#lang a:hover {
    background: var(--lang-hover);
    color: var(--lang-hover-color);
}

.tabs li a.active {
    background: var(--nav-active);
    color: var(--nav-active-color);
    border: var(--nav-active-border);
    box-shadow: var(--nav-active-box-shadow);
    text-shadow: var(--nav-active-text-shadow);
}

button {
    background: var(--btn-bg);
    color: var(--btn-text);
}

.card {
    background: var(--card-bg);
    color: var(--card-text);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* main area */

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: none;
}

.tab-content {
    display: none;
    width: 100%;
    max-width: 1000px;
    text-align: center;

    background: var(--tab-content-background);
    backdrop-filter: var(--tab-content-backdrop, none);
    -webkit-backdrop-filter: var(--tab-content-backdrop, none);

    border: var(--tab-content-border);
    border-radius: var(--tab-content-radius);
    box-shadow: var(--tab-content-shadow);
}

.tab-content.active {
    display: block;
}

footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: var(--footer-padding);
    margin-top: auto;

    backdrop-filter: var(--footer-backdrop);
    -webkit-backdrop-filter: var(--footer-backdrop);

    border-top: var(--footer-border);
    box-shadow: var(--footer-shadow);
}

.cursor {
    font-weight: bold;
    animation: blink 1s step-end infinite;
    color: var(--cursor-color);
}

@keyframes blink {

    from,
    to {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

#terminal-prefix {
    color: var(--terminal-prefix-color);
    font-family: 'JetBrains Mono', monospace;
}

footer p {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}

/* home area */

#home {
    padding: 60px 20px;
    text-align: center;
    position: relative;

    background-color: var(--home-bg);
    color: var(--home-text);
}

.home-container {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 40px;
}

.home-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    max-width: 400px;
}

.home-text {
    max-width: 500px;
    text-align: left;
}

#home h1 {
    font-size: 3rem;
    color: var(--home-h1-color);
    margin-bottom: 20px;
    font-weight: bold;
    text-transform: uppercase;
    text-shadow: var(--home-h1-shadow);
}

#home p {
    font-size: 1.2rem;
    color: var(--home-p-color);
    margin-bottom: 20px;
}

#home .intro p {
    font-size: 1.1rem;
    color: var(--home-intro-color);
    margin-top: 20px;
}

#home button {
    background-color: var(--home-button-bg);
    color: white;
    font-size: 1.2rem;
    padding: 15px 30px;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    margin-top: 20px;
}

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

span {
    color: var(--span-color);
    font-family: var(--span-font);
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

span:hover {
    color: var(--span-hover-color);
    text-shadow: var(--span-hover-shadow);
}

.home-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    max-width: 400px;
    transition: border 0.3s ease, box-shadow 0.3s ease;
    border: 3px solid transparent;
}

.home-image img:hover {
    border: 3px solid #003366;
    box-shadow: 0 0 10px #003366;
}

/* background section */

#background {
    background-color: var(--section-bg);
    padding: 40px 20px;
    color: var(--section-text);
    text-align: center;
}

#background h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--section-title);
    text-transform: uppercase;
}

.background-container {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 20px;
}

.experience-section,
.education-section {
    flex: 1;
    max-width: 45%;
}

.experience-section h2,
.education-section h2 {
    font-size: 2rem;
    color: var(--exp-title);
    margin-bottom: 20px;
}

.experience-box,
.education-box {
    display: flex;
    align-items: center;

    background: var(--exp-card-bg);
    color: var(--exp-card-text);

    border-radius: 10px;
    margin: 20px 0;
    padding: 20px;

    transition: transform 0.3s ease, box-shadow 0.3s ease;

    border: var(--exp-border);
    box-shadow: var(--exp-shadow);
}

.experience-box:hover,
.education-box:hover {
    transform: scale(1.02);
    box-shadow: var(--exp-card-hover-shadow);
}

.experience-image img,
.education-image img {
    max-width: 100px;
    height: auto;
    border-radius: 10px;
    margin-right: 20px;

    border: var(--exp-image-border);
    box-shadow: var(--exp-image-shadow);
}

.experience-text,
.education-text {
    text-align: left;
}

.experience-text h3,
.education-text h3 {
    font-size: 1.3rem;
    margin-bottom: 5px;
    color: var(--exp-title);
}

.experience-text p,
.education-text p {
    font-size: 1rem;
    color: var(--exp-subtext);
    margin: 5px 0;
}

/* projects section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.project-card {
    background: var(--project-card-bg);
    border: var(--project-card-border);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--project-card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 20px rgba(0, 51, 102, 0.3);
}

.project-card img,
.project-card video {
    width: 100%;
    height: auto;
    border-bottom: 3px solid var(--project-accent);
    display: block;
}

.project-details {
    padding: 15px;
    text-align: left;
}

.project-details h3 {
    font-size: 1.5rem;
    color: var(--project-title);
    margin-bottom: 10px;
}

.project-details p {
    font-size: 1rem;
    color: var(--project-text);
    margin-bottom: 15px;
}

.project-details button {
    background: var(--project-button-bg);
    color: white;
    padding: 10px 20px;
    border: 1px solid var(--project-accent);
    border-radius: 20px;
    cursor: pointer;
    transition: 0.3s ease;
}

.project-details button:hover {
    background: var(--project-button-hover);
    transform: translateY(1px) scale(1.02);
}

/* about section */
.about-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;

    background: var(--about-bg);
    border-radius: 15px;
    box-shadow: var(--about-container-shadow);
    backdrop-filter: blur(12px);
}

.about-image-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: 10px;

    border: var(--about-border);
    box-shadow: var(--about-image-glow);
}

.about-text-container {
    flex: 1.5;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-box {
    background: var(--about-box-bg);
    padding: 20px;
    border-radius: 10px;
    text-align: left;

    color: var(--about-text);
}

.about-box h2 {
    font-size: 1.8rem;
    color: var(--about-title);
    margin-bottom: 10px;
}

.about-box p,
.about-box ul {
    font-size: 1.1rem;
    color: var(--about-text);
}

.about-box ul {
    list-style: none;
    padding: 0;
}

.about-box ul li {
    margin: 8px 0;
    font-size: 1rem;

    background: var(--about-item-bg);
    color: var(--about-item-text);
    padding: 10px;
    border-radius: 8px;

    border: 1px solid rgba(0, 51, 102, 0.2);
}

/* contact section */
#contact-form {
    max-width: 600px;
    margin: 0 auto;

    background: var(--contact-bg);
    padding: 20px;
    border-radius: 10px;

    box-shadow: var(--contact-shadow);
    border: var(--contact-border);

    backdrop-filter: blur(10px);
}

#contact h1 {
    margin: 5px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    font-size: 1.1rem;
    color: var(--label-text);
    margin-bottom: 5px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;

    background: var(--input-bg);
    color: var(--input-text);

    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;

    transition: 0.2s ease;
}

.form-group textarea {
    resize: none;
}

button[type="submit"] {
    background: var(--btn-bg);
    color: var(--btn-text);

    font-size: 1.2rem;
    padding: 10px 20px;

    border: 1px solid #003366;
    border-radius: 20px;
    cursor: pointer;

    transition: 0.2s ease;
}

button[type="submit"]:hover {
    background: var(--btn-hover);
    transform: translateY(1px) scale(1.02);
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.social-icon {
    font-size: 2.5rem;

    color: var(--social-color);
    background: var(--social-bg);

    border-radius: 50%;
    width: 3.5rem;
    height: 3.5rem;

    border: var(--social-border);
    box-shadow: var(--social-shadow);

    text-decoration: none;
    transition: all 0.3s ease;

    display: flex;
    align-items: center;
    justify-content: center;
}

.social-icon:hover {
    color: var(--social-hover);
    background: var(--social-bg-hover);
    transform: scale(1.1);
    box-shadow: var(--social-shadow-hover);
}

.social-icon i {
    font-size: 2.5rem;
}

/* mobile layout */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .tabs {
        flex-direction: column;
        width: 100%;
    }

    .tabs li {
        margin: 10px 0;
    }

    .home-container {
        flex-direction: column;
        text-align: center;
    }

    .home-image,
    .home-text {
        max-width: 100%;
    }

    .background-container {
        flex-direction: column;
    }

    .experience-section,
    .education-section {
        max-width: 100%;
    }

    .about-container {
        flex-direction: column;
    }

    .about-image-container,
    .about-text-container {
        width: 100%;
    }

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

    footer {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .tabs li a {
        font-size: 16px;
        padding: 8px 10px;
    }

    #home h1 {
        font-size: 2.5rem;
    }

    #home p,
    .about-box p,
    .experience-text p {
        font-size: 1rem;
    }

    .home-image img {
        max-width: 300px;
    }
}

.hamburger-icon {
    display: none;
    cursor: pointer;
    font-size: 2rem;
    color: #fff;
}

@media (max-width: 768px) {
    .tabs {
        display: none;
        flex-direction: column;
        width: 100%;
    }

    .hamburger-icon {
        display: block;
    }

    .tabs.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 20px;

        background: var(--mobile-menu-bg);
        border-bottom: var(--mobile-menu-border);
        box-shadow: var(--mobile-menu-shadow);

        z-index: 999;
    }

    .tabs li {
        margin: 10px 0;
    }
}

#mobile-menu {
    transition: transform 0.3s ease;
}

#mobile-menu.active {
    transform: translateX(0);
}

#mobile-menu {
    transform: translateX(-100%);
}

/* =========================
   UTILITIES (optional later)
========================= */

.hidden {
    display: none;
}

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

.popup {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);

    background: var(--popup-bg);
    color: var(--popup-text);

    padding: 10px 20px;
    border-radius: 5px;

    font-size: 16px;
    box-shadow: var(--popup-shadow);

    z-index: 1000;

    display: none;
    opacity: 0;

    transition: opacity 0.5s ease;
}

.popup.show {
    display: block;
    opacity: 1;
}

#page-loader {
    background-color: var(--loader-bg);
}

/* shimmer effect on containers and boxes */
[data-theme="frutiger"] .about-box, 
[data-theme="frutiger"] .project-card, 
[data-theme="frutiger"] .experience-box {
    position: relative;
    overflow: hidden;
    /* Default local values */
    --mouse-x: 0px;
    --mouse-y: 0px;
    --shimmer-opacity: 0;
}

[data-theme="frutiger"] .about-box::before, 
[data-theme="frutiger"] .project-card::before, 
[data-theme="frutiger"] .experience-box::before {
    content: "";
    position: absolute;
    inset: 0;
    /* We use a smaller circle for better "gloss" effect */
    background: radial-gradient(
        400px circle at var(--mouse-x) var(--mouse-y), 
        rgba(255, 255, 255, 0.3), 
        transparent 40%
    );
    z-index: 5; /* Sit above the background but below text if needed */
    pointer-events: none;
    opacity: var(--shimmer-opacity);
    transition: opacity 0.3s ease;
}
/* end shimmer effect */