:root {
    --color-primary: #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-primary-bg: #EFF6FF;
    --color-text: #1F2937;
    --color-text-secondary: #6B7280;
    --color-text-light: #9CA3AF;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F9FAFB;
    --color-border: #E5E7EB;
    --color-card-shadow: rgba(0, 0, 0, 0.06);
    --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --max-width: 1100px;
    --nav-height: 64px;
    --radius: 10px;
    --radius-sm: 6px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 12px);
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

code {
    font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
    font-size: 0.94em;
    color: var(--color-primary-dark);
    background: var(--color-primary-bg);
    border-radius: 6px;
    padding: 2px 6px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.7);
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.nav-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    gap: 28px;
    align-items: center;
    min-width: 0;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-primary);
}

.hero {
    padding-top: calc(var(--nav-height) + 80px);
    padding-bottom: 72px;
    background: linear-gradient(165deg, var(--color-primary-bg) 0%, var(--color-bg) 60%);
}

.hero-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.9fr);
    gap: 28px;
    align-items: stretch;
}

.hero-content {
    max-width: 700px;
}

.hero-greeting {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.hero-name {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
    margin-bottom: 12px;
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 1.03rem;
    color: var(--color-text-secondary);
    line-height: 1.85;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary-bg);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 9px 16px;
    font-size: 0.88rem;
}

.summary-card,
.intro-panel,
.project-card,
.content-card,
.approach-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px var(--color-card-shadow);
}

.summary-card {
    padding: 28px;
}

.summary-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 18px;
}

.summary-list {
    display: grid;
    gap: 16px;
}

.summary-item {
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
}

.summary-item:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.summary-item dt {
    font-size: 0.84rem;
    color: var(--color-text-light);
    margin-bottom: 5px;
}

.summary-item dd {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.65;
}

.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-label {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.84rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    position: relative;
    display: inline-block;
    margin-bottom: 12px;
}

.section-title::after {
    content: "";
    display: block;
    width: 40px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    margin-top: 8px;
}

.section-subtitle {
    color: var(--color-text-secondary);
    font-size: 1rem;
    margin-bottom: 36px;
    max-width: 760px;
}

.intro-panel {
    padding: 32px;
}

.intro-panel p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.9;
    margin-bottom: 14px;
}

.intro-panel p:last-child {
    margin-bottom: 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    margin-top: 12px;
}

.project-card {
    padding: 32px;
    transition: box-shadow var(--transition), transform var(--transition);
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 18px;
}

.project-card:hover {
    box-shadow: 0 10px 28px var(--color-card-shadow);
    transform: translateY(-2px);
}

.project-header {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.project-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.project-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.4;
}

.project-desc {
    font-size: 0.94rem;
    color: var(--color-text-secondary);
    line-height: 1.75;
}

.project-actions {
    display: flex;
}

.experience-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 24px;
    align-items: start;
}

.task-switch {
    display: inline-flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.task-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    color: var(--color-text-secondary);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.task-button:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.task-button.is-active {
    background: var(--color-primary-bg);
    border-color: rgba(37, 99, 235, 0.2);
    color: var(--color-primary);
}

.task-button:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.experience-form {
    display: grid;
    gap: 14px;
}

.field-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text);
}

.experience-textarea {
    width: 100%;
    min-height: 280px;
    resize: vertical;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg-alt);
    color: var(--color-text);
    font: inherit;
    line-height: 1.8;
    padding: 16px 18px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.experience-textarea::placeholder {
    color: var(--color-text-light);
}

.experience-textarea:focus {
    outline: none;
    border-color: rgba(37, 99, 235, 0.35);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.experience-textarea:disabled {
    opacity: 0.72;
    cursor: wait;
}

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.status-text,
.error-text,
.results-empty {
    font-size: 0.9rem;
    line-height: 1.7;
}

.status-text {
    min-height: 24px;
    color: var(--color-text-secondary);
}

.error-text {
    color: #B91C1C;
}

.experience-note {
    margin-top: -4px;
}

.results-shell {
    min-height: 100%;
}

.results-empty {
    color: var(--color-text-light);
}

.result-card p {
    color: var(--color-text-secondary);
    font-size: 0.93rem;
    line-height: 1.75;
}

.case-intro,
.full-width-card {
    margin-bottom: 24px;
}

.case-intro {
    max-width: 760px;
}

.case-intro p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.9;
}

.case-grid,
.support-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    margin-bottom: 24px;
}

.content-card {
    padding: 28px;
}

.case-block-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 18px;
}

.sample-shell {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
}

.sample-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 14px;
}

.sample-meta span {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.84rem;
}

.sample-block {
    padding: 16px 0;
    border-top: 1px solid var(--color-border);
}

.sample-block:first-of-type {
    padding-top: 0;
    border-top: 0;
}

.sample-block:last-child {
    padding-bottom: 0;
}

.sample-label {
    font-size: 0.86rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.sample-block p:last-child {
    color: var(--color-text-secondary);
}

.sample-note {
    margin-top: 10px;
    color: var(--color-text-light);
    font-size: 0.84rem;
    line-height: 1.7;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.result-card {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
}

.result-card h4 {
    font-size: 0.96rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.dot-list,
.step-list {
    display: grid;
    gap: 10px;
}

.dot-list li,
.step-list li {
    position: relative;
    padding-left: 18px;
    color: var(--color-text-secondary);
    font-size: 0.93rem;
    line-height: 1.75;
}

.dot-list li::before,
.step-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
}

.approach-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.approach-card {
    padding: 24px;
    min-height: 150px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.approach-index {
    width: 34px;
    height: 34px;
    border-radius: 999px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.95rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.approach-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.75;
}

.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

@media (max-width: 900px) {
    .hero-shell,
    .projects-grid,
    .experience-grid,
    .case-grid,
    .support-grid,
    .approach-grid,
    .result-grid {
        grid-template-columns: 1fr;
    }

    .nav-container {
        gap: 16px;
    }

    .nav-menu {
        gap: 18px;
        overflow-x: auto;
        padding-bottom: 4px;
    }
}

@media (max-width: 768px) {
    .hero {
        padding-top: calc(var(--nav-height) + 48px);
        padding-bottom: 48px;
    }

    .hero-name {
        font-size: 2.2rem;
    }

    .hero-title {
        font-size: 1.1rem;
    }

    .section {
        padding: 56px 0;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .summary-card,
    .intro-panel,
    .project-card,
    .content-card,
    .approach-card {
        padding: 24px;
    }
}

@media (max-width: 560px) {
    .nav-container {
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        padding-top: 10px;
        padding-bottom: 10px;
        height: auto;
    }

    .nav {
        height: auto;
    }

    html {
        scroll-padding-top: 112px;
    }

    .hero {
        padding-top: 132px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .container {
        padding: 0 18px;
    }

    .project-card,
    .content-card,
    .summary-card,
    .intro-panel,
    .approach-card {
        padding: 20px;
    }
}