/* ==========================================================================
   CSS VARIABLES & DESIGN SYSTEM (รองรับการตั้งค่าสีหลัก ความกว้างหน้าจอ และฟอนต์)
   ========================================================================== */
:root {
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;

    /* ชุดสีสไตล์ Dark Mode Premium */
    --color-bg-deep: #070b14;
    --color-bg-dark: #0a0f1d;
    --color-text-white: #ffffff;
    --color-text-gray: #94a3b8;

    /* สีเน้นไล่เฉด (Gradients) */
    --gradient-primary: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
    --gradient-accent: linear-gradient(135deg, #b19ffb 0%, #fc67fa 100%);

    /* สไตล์สำหรับ Glassmorphism (กระจกฝ้า) */
    --glass-bg: rgba(15, 23, 42, 0.45);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-glow: rgba(0, 242, 254, 0.15);

    /* สัดส่วนเลย์เอาต์และการจัดเรียง (Responsive Breakpoints) */
    --container-max-width: 1200px;
    --header-height: 80px;

    /* ความลื่นไหลในการแสดงผล (Transition & Anim) */
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);

    /* ตัวแปรสีเพิ่มเติมเพื่อรองรับ Light Mode */
    --header-bg: rgba(7, 11, 20, 0.7);
    --header-bg-scroll: rgba(7, 11, 20, 0.9);
    --nav-menu-bg: rgba(10, 15, 29, 0.95);
    --footer-bg: #05080e;
    --input-bg: rgba(255, 255, 255, 0.03);
    --item-bg-subtle: rgba(255, 255, 255, 0.03);
    --border-subtle: rgba(255, 255, 255, 0.05);
    --orb-opacity: 0.15;
    --project-text-color: #070b14;
    --btn-secondary-bg: rgba(255, 255, 255, 0.05);
    --btn-secondary-hover-bg: rgba(255, 255, 255, 0.1);
    --btn-secondary-text: #ffffff;
    --contact-link-color: #00f2fe;

    /* ไอคอนและปุ่มสลับธีม */
    --toggle-btn-bg: rgba(255, 255, 255, 0.05);
    --toggle-btn-border: rgba(255, 255, 255, 0.1);
    --toggle-btn-color: #ffffff;
}

[data-theme="light"] {
    --color-bg-deep: #f1f5f9;
    --color-bg-dark: #ffffff;
    --color-text-white: #0f172a;
    --color-text-gray: #475569;

    /* สไตล์สำหรับ Glassmorphism ในโหมดสว่าง */
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(15, 23, 42, 0.08);
    --glass-glow: rgba(0, 242, 254, 0.08);

    /* ตัวแปรสีเพิ่มเติมสำหรับ Light Mode */
    --header-bg: rgba(241, 245, 249, 0.7);
    --header-bg-scroll: rgba(241, 245, 249, 0.95);
    --nav-menu-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: #e2e8f0;
    --input-bg: rgba(15, 23, 42, 0.04);
    --item-bg-subtle: rgba(15, 23, 42, 0.03);
    --border-subtle: rgba(15, 23, 42, 0.06);
    --orb-opacity: 0.08;
    --project-text-color: #ffffff;
    --btn-secondary-bg: rgba(15, 23, 42, 0.05);
    --btn-secondary-hover-bg: rgba(15, 23, 42, 0.1);
    --btn-secondary-text: #0f172a;
    --contact-link-color: #4facfe;

    --toggle-btn-bg: rgba(15, 23, 42, 0.05);
    --toggle-btn-border: rgba(15, 23, 42, 0.1);
    --toggle-btn-color: #0f172a;
}

/* ==========================================================================
   BASE RESET (คืนค่าตั้งต้นเพื่อความยืดหยุ่นในทุกเบราว์เซอร์)
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
    /* บังคับให้การกดเมนูเลื่อนอย่างลื่นไหล */
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-deep);
    color: var(--color-text-white);
    line-height: 1.6;
    overflow-x: hidden;
    /* ป้องกันหน้าจอเลื่อนหลุดขอบข้างในมือถือ */
    -webkit-font-smoothing: antialiased;
}

/* ลิงก์และปุ่ม */
a {
    text-decoration: none;
    color: inherit;
}

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

/* ==========================================================================
   BACKGROUND ORBS (ลูกบอลเรืองแสงพื้นหลัง ขยับช้าๆ เพิ่มความลึกให้ดีไซน์)
   ========================================================================== */
.glow-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: var(--orb-opacity);
    animation: orb-float 20s infinite alternate ease-in-out;
}

.orb-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: #00f2fe;
}

.orb-2 {
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: #fc67fa;
    animation-delay: -10s;
}

@keyframes orb-float {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(5%, 10%) scale(1.1);
    }
}

/* ==========================================================================
   LAYOUT CONTAINERS (จัดตำแหน่งเนื้อหาให้อยู่ตรงกลางและกว้างพอดีสำหรับหน้าจอใหญ่)
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    /* การใช้ rem/em ช่วยปรับระยะขอบด้านข้างอย่างยืดหยุ่นตามอุปกรณ์ */
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
    /* ระยะห่างความสูงแต่ละ Section */
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--color-text-gray);
    font-size: 1.1rem;
}

/* ==========================================================================
   GLASSMORPHISM BASE CLASS (คลาสกระจกฝ้า ตกแต่งการสะท้อน)
   ========================================================================== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    transition: var(--transition-smooth);
}

.glass:hover {
    border-color: rgba(0, 242, 254, 0.25);
    box-shadow: 0 12px 40px 0 rgba(0, 242, 254, 0.08);
}

/* ==========================================================================
   COMPONENTS: BUTTONS (ปุ่มกดแบบไล่ระดับสีและเอฟเฟกต์ Glass)
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-family: var(--font-primary);
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    outline: none;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #070b14;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 242, 254, 0.5);
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(5px);
}

.btn-secondary:hover {
    background: var(--btn-secondary-hover-bg);
    border-color: var(--border-subtle);
    transform: translateY(-3px);
}

/* ==========================================================================
   HEADER & NAVIGATION BAR (ปรับให้คงที่ด้านบนและโปร่งใส)
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 100;
    display: flex;
    align-items: center;
    transition: var(--transition-smooth);
}

/* เมือสกรอลหน้าเว็บลง ให้ Header แนบชิดขึ้นและเล็กลง */
.header.scroll-active {
    height: 70px;
    background: var(--header-bg-scroll);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-gray);
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition-smooth);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-white);
}

/* สร้างเส้นขีดล่างของเมนูแบบอนิเมชัน */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ปุ่ม Hamburger (ถูกซ่อนบนหน้าจอขนาดใหญ่) */
.hamburger-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 25px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.hamburger-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-white);
    border-radius: 4px;
    transition: var(--transition-smooth);
}

/* ==========================================================================
   HERO SECTION (พื้นที่แนะนำตัว โดดเด่นเป็นพิเศษ)
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    position: relative;
}

.hero-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 3rem;
}

.hero-content {
    flex: 1;
    max-width: 650px;
}

.hero-profile {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-img-wrapper {
    width: 320px;
    height: 320px;
    border-radius: 50% !important;
    overflow: hidden;
    border: 3px solid var(--glass-border);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%;
    transition: var(--transition-smooth);
}

.profile-img-wrapper:hover .profile-img {
    transform: scale(1.05);
}

.hero-tagline {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: #00f2fe;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 1rem;
    display: inline-block;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--color-text-gray);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
}

/* ==========================================================================
   ABOUT ME SECTION
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2.5rem;
}

.about-card,
.skills-card {
    padding: 3rem;
}

.about-card h3,
.skills-card h3 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.about-text {
    color: var(--color-text-gray);
    margin-bottom: 1.5rem;
}

.about-text:last-of-type {
    margin-bottom: 0;
}

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.skill-category h4 {
    color: #4facfe;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: var(--item-bg-subtle);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.skill-tag:hover {
    background: rgba(0, 242, 254, 0.1);
    border-color: rgba(0, 242, 254, 0.3);
    color: #00f2fe;
    transform: translateY(-2px);
}

/* Custom Profile details and hobbies list */
.profile-details-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.profile-detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 0.8rem;
}

.profile-detail-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.detail-label {
    font-weight: 600;
    color: var(--color-text-gray);
    font-size: 0.95rem;
}

.detail-value {
    color: var(--color-text-white);
    font-weight: 500;
    text-align: right;
}

.sub-section-title {
    margin-top: 2.5rem;
    border-top: 1px solid var(--border-subtle);
    padding-top: 1.5rem;
}

.card-icon-title {
    margin-right: 0.5rem;
}

.hobbies-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin-top: 1rem;
}

.hobby-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--item-bg-subtle);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    transition: var(--transition-smooth);
}

.hobby-item:hover {
    background: rgba(0, 242, 254, 0.05);
    border-color: rgba(0, 242, 254, 0.2);
    transform: translateX(5px);
}

.hobby-icon {
    font-size: 1.8rem;
}

.hobby-content {
    display: flex;
    flex-direction: column;
}

.hobby-title {
    font-weight: 600;
    color: var(--color-text-white);
    font-size: 1rem;
}

.hobby-desc {
    color: var(--color-text-gray);
    font-size: 0.85rem;
}

.contact-link {
    color: var(--contact-link-color);
    transition: var(--transition-smooth);
}

.contact-link:hover {
    color: #fff;
    text-decoration: underline;
}

/* ==========================================================================
   PROJECTS SECTION (แสดงด้วย CSS Grid Card)
   ========================================================================== */
.projects-grid {
    display: grid;
    /* auto-fit และ minmax ช่วยจัดการการ์ดผลงานให้ Responsive อัตโนมัติ */
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.project-img-wrapper {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.project-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--project-text-color);
    transition: var(--transition-smooth);
}

.project-card:hover .project-img-placeholder {
    transform: scale(1.05);
}

.project-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
}

.project-desc {
    color: var(--color-text-gray);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
    /* ช่วยให้การ์ดยืดสูงเท่ากัน แม้เนื้อหาจะยาวต่างกัน */
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--item-bg-subtle);
    color: var(--color-text-gray);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
}

.project-links {
    display: flex;
    gap: 1.5rem;
}

.project-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: #00f2fe;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

.project-link:hover {
    color: #ffffff;
    text-decoration: underline;
}

.project-link-disabled {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-gray);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.8;
}

/* ==========================================================================
   CONTACT SECTION (ช่องทางติดต่อและแบบฟอร์มตรวจสอบข้อมูล)
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 2.5rem;
}

.contact-info-card {
    padding: 3rem;
    display: flex;
    flex-direction: column;
}

.contact-info-card h3 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.contact-desc {
    color: var(--color-text-gray);
    margin-bottom: 2rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-text {
    font-size: 1.05rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-link {
    font-weight: 600;
    font-size: 1rem;
    color: #4facfe;
    transition: var(--transition-smooth);
}

.social-link:hover {
    color: #00f2fe;
    transform: translateY(-2px);
}

/* สไตล์กล่องฟอร์ม */
.contact-form {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-gray);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--color-text-white);
    font-family: var(--font-primary);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-smooth);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: #00f2fe;
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.1);
}

/* การจัดการข้อผิดพลาดข้อมูล Form */
.error-msg {
    color: #ff5858;
    font-size: 0.85rem;
    display: none;
}

.form-group.invalid input,
.form-group.invalid textarea {
    border-color: #ff5858;
}

.form-group.invalid .error-msg {
    display: block;
}

.form-success-msg {
    background: rgba(46, 213, 115, 0.1);
    color: #2ed573;
    border: 1px solid rgba(46, 213, 115, 0.2);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    padding: 2.5rem 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    background: var(--footer-bg);
}

.footer-content p {
    color: var(--color-text-gray);
    font-size: 0.95rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   การควบคุมและปรับแต่งเลย์เอาต์ตามขนาดหน้าจอต่างๆ 
   ========================================================================== */

/* 1. สำหรับขนาด Tablet & Mobile (กว้างน้อยกว่า 992px) */
@media screen and (max-width: 992px) {
    .section {
        padding: 5rem 0;
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .hero-container {
        flex-direction: column-reverse;
        text-align: center;
        gap: 2rem;
        padding-top: 2rem;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .profile-img-wrapper {
        width: 260px;
        height: 260px;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        /* ยุบจาก Grid 2 คอลัมน์เหลือคอลัมน์เดียว */
        gap: 2rem;
    }

    .about-card,
    .skills-card,
    .contact-info-card,
    .contact-form {
        padding: 2rem;
        /* ลด Padding เพื่อเว้นระยะที่สวยงาม */
    }
}

/* 2. สำหรับมือถือ (กว้างน้อยกว่า 768px) - เปลี่ยนเมนูเป็น Hamburger */
@media screen and (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-desc {
        font-size: 1.05rem;
        margin-bottom: 2rem;
    }

    /* ซ่อน Navbar ปกติ และเปลี่ยนเป็นแบบสไลด์ทับเต็มจอ */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        /* เลื่อนไปซ่อนทางขวาของหน้าจอ */
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background: var(--nav-menu-bg);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border-left: 1px solid var(--glass-border);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 3rem;
        transition: right 0.4s ease-in-out;
        z-index: 100;
    }

    /* คลาสที่เพิ่มผ่าน JavaScript เพื่อเลื่อนเมนูออกมา */
    .nav-menu.open {
        right: 0;
    }

    /* แสดงปุ่ม Hamburger */
    .hamburger-toggle {
        display: flex;
    }

    /* เปลี่ยนรูปทรง Hamburger เป็นกากบาท (X) เมื่อเปิดเมนู */
    .hamburger-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .section-title {
        font-size: 2rem;
    }
}

/* 3. สำหรับหน้าจอมือถือเล็กมาก (กว้างน้อยกว่า 480px) */
@media screen and (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .hero-buttons {
        flex-direction: column;
        /* ปุ่มเรียงแนวตั้ง */
        gap: 1rem;
    }

    .btn {
        width: 100%;
        /* ปุ่มขยายเต็มความกว้าง */
    }

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

/* ==========================================================================
   THEME TOGGLE BUTTON STYLES
   ========================================================================== */
.theme-toggle-wrapper {
    display: flex;
    align-items: center;
}

.theme-toggle {
    background: var(--toggle-btn-bg);
    border: 1px solid var(--toggle-btn-border);
    color: var(--toggle-btn-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-smooth);
    padding: 0;
    outline: none;
    position: relative;
    overflow: hidden;
    margin-left: 1rem;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: var(--btn-secondary-hover-bg);
    border-color: var(--contact-link-color);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    position: absolute;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

/* Show/hide icons depending on theme */
[data-theme="light"] .theme-toggle .sun-icon {
    transform: translateY(40px);
    opacity: 0;
}

[data-theme="light"] .theme-toggle .moon-icon {
    transform: translateY(0);
    opacity: 1;
}

.theme-toggle .sun-icon {
    transform: translateY(0);
    opacity: 1;
}

.theme-toggle .moon-icon {
    transform: translateY(-40px);
    opacity: 0;
}

/* ปรับระยะขอบและตำแหน่งในโมบายล์ */
@media screen and (max-width: 768px) {
    .theme-toggle {
        margin-left: 0;
        margin-right: 1rem;
    }
}

/* ==========================================================================
   STICKY BOTTOM MENU (สำหรับ Mobile & Tablet)
   ========================================================================== */
.sticky-bottom-menu {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 40px);
    max-width: 480px;
    height: 65px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 50px;
    display: none; /* ซ่อนบน Desktop */
    justify-content: space-around;
    align-items: center;
    padding: 0 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    z-index: 999;
    transition: var(--transition-smooth);
}

.sticky-menu-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-gray);
    font-size: 0.75rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    text-decoration: none;
    width: 65px;
    height: 100%;
    gap: 4px;
}

.sticky-menu-item svg {
    width: 22px;
    height: 22px;
    transition: var(--transition-smooth);
}

.sticky-menu-item:hover,
.sticky-menu-item.active {
    color: var(--color-text-white);
}

.sticky-menu-item.active svg {
    color: #00f2fe;
    transform: translateY(-2px);
}

/* แสดงผลเฉพาะบนหน้าจอ Tablet และ Mobile (ต่ำกว่า 768px) */
@media screen and (max-width: 768px) {
    .sticky-bottom-menu {
        display: flex;
    }
    
    /* ป้องกันแถบเมนูบังปุ่ม/ตัวหนังสือล่างสุด */
    .footer {
        padding-bottom: 6rem;
    }
}