/* ===== CSS Variables (non-color — colors come from theme files) ===== */
:root {
    --font-family: 'Noto Sans TC', sans-serif;
    --transition: all 0.3s ease;
    --radius: 12px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-primary);
    color: var(--color-white);
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
}

/* 全頁 section 在 canvas 背景之上 */
#hero, #services, #portfolio, #workflow, #contact, #footer {
    position: relative;
    z-index: 1;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
ul { list-style: none; }

/* ===== Utility ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-tag.blue {
    background: var(--tag-blue-bg);
    color: var(--color-blue);
    border: 1px solid var(--tag-blue-border);
}

.section-tag.purple {
    background: var(--tag-purple-bg);
    color: var(--color-purple);
    border: 1px solid var(--tag-purple-border);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-gray);
    max-width: 560px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--gradient-blue);
    color: var(--btn-text, #000);
    font-weight: 700;
    font-size: 1rem;
    padding: 14px 32px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--btn-shadow);
    font-family: var(--font-family);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--btn-shadow-hover);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: transparent;
    color: var(--color-white);
    font-weight: 500;
    font-size: 1rem;
    padding: 13px 30px;
    border-radius: 50px;
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
}

.btn-outline:hover {
    border-color: var(--color-blue);
    color: var(--color-blue);
}

/* ===== Header / Nav ===== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    height: 70px;
    display: flex;
    align-items: center;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background 0.4s ease;
}

#header.scrolled {
    background: var(--header-bg-scrolled);
}

#heroCanvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.nav-inner {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 900;
    letter-spacing: 0.04em;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-mixed);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 900;
    color: #fff;
}

.logo-text span { color: var(--color-blue); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-gray);
    padding: 7px 14px;
    border-radius: 20px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-white);
    background: var(--nav-hover-bg);
}

.nav-cta {
    background: var(--gradient-blue) !important;
    color: var(--btn-text, #000) !important;
    font-weight: 700 !important;
    padding: 8px 20px !important;
}

.nav-cta:hover { opacity: 0.9; }

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}


.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
#hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 70px;
}


.hero-content {
    position: relative;
    z-index: 1;
    padding: 80px 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--tag-blue-bg);
    border: 1px solid var(--tag-blue-border);
    color: var(--color-blue);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 28px;
    letter-spacing: 0.05em;
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-blue);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-title {
    font-size: clamp(2.4rem, 6vw, 4.4rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-title .line-blue { color: var(--color-blue); }
.hero-title .line-purple { color: var(--color-purple); }

.hero-desc {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--color-gray);
    max-width: 600px;
    margin-bottom: 48px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 80px;
    flex-wrap: wrap;
}

.stat-item { text-align: left; }

.stat-num {
    font-size: 2.2rem;
    font-weight: 900;
    background: var(--gradient-mixed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--color-gray);
    letter-spacing: 0.04em;
}

/* ===== Section Common ===== */
.section {
    padding: 100px 0;
}

.section-header {
    margin-bottom: 64px;
}

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

.section-header.center .section-subtitle {
    margin: 0 auto;
}

/* ===== Services ===== */
#services {
    background: var(--bg-secondary-t);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card-t);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: default;
}

.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.4s ease;
    border-radius: var(--radius);
}

.service-card.blue::before { background: radial-gradient(circle at top left, rgba(0,229,255,0.07), transparent 60%); }
.service-card.purple::before { background: radial-gradient(circle at top left, rgba(138,43,226,0.08), transparent 60%); }
.service-card.mixed::before { background: radial-gradient(circle at top left, rgba(0,229,255,0.05), rgba(138,43,226,0.05) 60%); }

.service-card:hover { transform: translateY(-6px) scale(1.01); }
.service-card:hover::before { opacity: 1; }
.service-card.blue:hover { border-color: rgba(0,229,255,0.3); box-shadow: 0 8px 40px rgba(0,229,255,0.1); }
.service-card.purple:hover { border-color: rgba(138,43,226,0.3); box-shadow: 0 8px 40px rgba(138,43,226,0.12); }
.service-card.mixed:hover { border-color: rgba(138,43,226,0.25); box-shadow: 0 8px 40px rgba(138,43,226,0.08); }

.service-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 1.6rem;
}

.service-icon.blue { background: rgba(0,229,255,0.12); border: 1px solid rgba(0,229,255,0.2); }
.service-icon.purple { background: rgba(138,43,226,0.12); border: 1px solid rgba(138,43,226,0.25); }
.service-icon.mixed { background: linear-gradient(135deg, rgba(0,229,255,0.1), rgba(138,43,226,0.12)); border: 1px solid rgba(138,43,226,0.2); }

.service-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-desc {
    font-size: 0.9rem;
    color: var(--color-gray);
    line-height: 1.7;
    margin-bottom: 24px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    font-size: 0.75rem;
    padding: 3px 12px;
    border-radius: 20px;
    font-weight: 500;
}

.tag.blue { background: var(--tag-blue-bg); color: var(--color-blue); border: 1px solid var(--tag-blue-border); }
.tag.purple { background: var(--tag-purple-bg); color: var(--color-purple); border: 1px solid var(--tag-purple-border); }

/* ===== Portfolio ===== */
#portfolio { background: var(--bg-primary-t); }

.portfolio-filters {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    font-size: 0.85rem;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: 20px;
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-gray);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
}

.filter-btn:hover,
.filter-btn.active {
    background: rgba(0,229,255,0.1);
    border-color: rgba(0,229,255,0.35);
    color: var(--color-blue);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.portfolio-item {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-card-t);
    border: 1px solid var(--color-border);
    aspect-ratio: 4/3;
    transition: var(--transition);
}

.portfolio-item:hover { transform: translateY(-4px); border-color: rgba(0,229,255,0.25); }

.portfolio-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.portfolio-item:hover .portfolio-thumb { transform: scale(1.05); }

.portfolio-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 2.5rem;
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10,10,14,0.92) 0%, rgba(10,10,14,0.4) 50%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    opacity: 0;
    transition: opacity 0.35s ease;
}

.portfolio-item:hover .portfolio-overlay { opacity: 1; }

.portfolio-overlay h4 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.portfolio-overlay p { font-size: 0.8rem; color: var(--color-gray); margin-bottom: 12px; }

.portfolio-tech { display: flex; gap: 6px; flex-wrap: wrap; }
.portfolio-tech span {
    font-size: 0.7rem;
    padding: 2px 10px;
    border-radius: 10px;
    background: rgba(0,229,255,0.15);
    color: var(--color-blue);
    border: 1px solid rgba(0,229,255,0.2);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active { opacity: 1; pointer-events: all; }

.modal-box {
    background: rgba(30, 30, 36, 0.97);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    max-width: 700px;
    width: 100%;
    padding: 40px;
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-box { transform: scale(1); }

.modal-close {
    position: absolute;
    top: 16px; right: 16px;
    width: 36px; height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-gray);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-family: var(--font-family);
}

.modal-close:hover { border-color: var(--color-blue); color: var(--color-blue); }

/* ===== Workflow ===== */
#workflow { background: var(--bg-secondary-t); }

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
}

.workflow-steps::before {
    content: '';
    position: absolute;
    top: 32px;
    left: calc(12.5%);
    right: calc(12.5%);
    height: 2px;
    background: linear-gradient(to right, var(--color-blue), var(--color-purple));
    opacity: 0.35;
}

.workflow-step {
    padding: 0 20px;
    text-align: center;
    position: relative;
}

.step-num {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-card-t);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 1.3rem;
    font-weight: 900;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.workflow-step:nth-child(1) .step-num { border-color: var(--color-blue); color: var(--color-blue); box-shadow: 0 0 20px rgba(0,229,255,0.2); }
.workflow-step:nth-child(2) .step-num { border-color: #44bbff; color: #44bbff; box-shadow: 0 0 20px rgba(68,187,255,0.15); }
.workflow-step:nth-child(3) .step-num { border-color: #9945e0; color: #9945e0; box-shadow: 0 0 20px rgba(153,69,224,0.15); }
.workflow-step:nth-child(4) .step-num { border-color: var(--color-purple); color: #c07aff; box-shadow: 0 0 20px rgba(138,43,226,0.2); }

.step-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 0.85rem; color: var(--color-gray); line-height: 1.6; }

/* ===== Contact ===== */
#contact { background: var(--bg-primary-t); }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 64px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-info .subtitle {
    font-size: 0.9rem;
    color: var(--color-gray);
    margin-bottom: 40px;
}

.contact-items { display: flex; flex-direction: column; gap: 20px; }

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(0,229,255,0.06);
    border: 1px solid rgba(0,229,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-item-label { font-size: 0.75rem; color: var(--color-gray); margin-bottom: 2px; }
.contact-item-value { font-size: 0.95rem; font-weight: 500; }

.social-links { display: flex; gap: 12px; margin-top: 40px; }

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--bg-card-t);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition);
}

.social-link:hover { border-color: var(--color-blue); color: var(--color-blue); transform: translateY(-2px); }

/* Form */
.contact-form {
    background: var(--bg-card-t);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 40px;
}

.contact-form h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.contact-form .sub { font-size: 0.85rem; color: var(--color-gray); margin-bottom: 32px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.form-group label { font-size: 0.82rem; font-weight: 600; color: var(--color-gray); }

.form-group input,
.form-group select,
.form-group textarea {
    background: var(--bg-secondary-t);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 13px 16px;
    color: var(--color-white);
    font-size: 0.9rem;
    font-family: var(--font-family);
    transition: border-color 0.25s ease;
    outline: none;
    width: 100%;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(0,229,255,0.08);
}

.form-group select { cursor: pointer; }
.form-group select option { background: var(--bg-card); }

.form-group textarea { resize: vertical; min-height: 110px; }

.form-submit {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 8px;
}

.btn-submit {
    background: var(--gradient-blue);
    color: var(--btn-text, #000);
    font-weight: 700;
    font-size: 0.95rem;
    padding: 13px 32px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
    box-shadow: var(--btn-shadow);
}

.btn-submit:hover { transform: translateY(-2px); box-shadow: var(--btn-shadow-hover); }

.form-note { font-size: 0.78rem; color: var(--color-gray); }

/* ===== Footer ===== */
#footer {
    background: var(--bg-secondary-t);
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    text-align: center;
}

.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-logo { font-size: 1.1rem; font-weight: 700; }
.footer-logo span { color: var(--color-blue); }
.footer-copy { font-size: 0.82rem; color: var(--color-gray); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 0.82rem; color: var(--color-gray); transition: var(--transition); }
.footer-links a:hover { color: var(--color-blue); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
    .workflow-steps { grid-template-columns: repeat(2, 1fr); gap: 40px; }
    .workflow-steps::before { display: none; }
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }

    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px; left: 0; right: 0;
        background: rgba(18,18,20,0.97);
        backdrop-filter: blur(20px);
        padding: 20px 24px 28px;
        border-bottom: 1px solid var(--color-border);
        gap: 4px;
    }

    .services-grid { grid-template-columns: 1fr; }
    .portfolio-grid { grid-template-columns: 1fr; }
    .workflow-steps { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .hero-stats { gap: 24px; }
    .footer-inner { justify-content: center; text-align: center; }
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* ===== Nav Dropdowns (theme & lang) ===== */
.nav-icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(0, 229, 255, 0.35);
    background: rgba(0, 229, 255, 0.07);
    color: var(--color-blue);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.nav-icon-btn:hover,
.nav-dropdown-wrap.open .nav-icon-btn {
    background: rgba(0, 229, 255, 0.18);
    border-color: var(--color-blue);
    box-shadow: 0 0 12px rgba(0, 229, 255, 0.25);
}

.nav-icon-btn svg { display: block; pointer-events: none; }

.nav-dropdown-wrap { position: relative; }

.nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 160px;
    background: var(--bg-card-t);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 8px;
    z-index: 500;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-dropdown-wrap.open .nav-dropdown {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.nav-drop-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-gray);
    padding: 4px 10px 8px;
}

.nav-drop-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 9px 10px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--color-white);
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 0.85rem;
    transition: var(--transition);
    text-align: left;
    position: relative;
}

.nav-drop-item:hover { background: rgba(255, 255, 255, 0.07); }

.nav-drop-item.active { color: var(--color-blue); }

.nav-drop-item .check-icon {
    margin-left: auto;
    font-size: 0.75rem;
    opacity: 0;
    color: var(--color-blue);
}

.nav-drop-item.active .check-icon { opacity: 1; }

.theme-swatch {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 1px solid rgba(255,255,255,0.15);
}