:root {
    --ink: #1d2a2d;
    --muted: #6d7678;
    --page: #f3faf9;
    --page-soft: #e8f7f2;
    --panel: rgba(255, 255, 255, 0.72);
    --panel-strong: rgba(255, 255, 255, 0.86);
    --line: rgba(43, 55, 58, 0.14);
    --green: #b2e0d6;
    --rose: #b86a6c;
    --gold: #ab7b35;
    --shadow: 0 18px 45px rgba(35, 45, 48, 0.14);
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--ink);
    font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Microsoft YaHei", sans-serif;
    line-height: 1.55;
    background:
        radial-gradient(circle at 16% 0%, rgba(232, 247, 242, 0.52), transparent 30rem),
        linear-gradient(180deg, #fbfefe 0%, var(--page) 52%, #f7fbfd 100%);
}

a {
    color: inherit;
}

.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 16px clamp(20px, 5vw, 72px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.60);
    box-shadow: 0 12px 34px rgba(38, 62, 70, 0.08);
    backdrop-filter: blur(18px) saturate(1.2);
    -webkit-backdrop-filter: blur(18px) saturate(1.2);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: max-content;
    color: #334f64;
    font-weight: 800;
    text-decoration: none;
    text-shadow: 0 1px 12px rgba(255, 255, 255, 0.45);
}

.brand-mark {
    width: 34px;
    height: 34px;
    object-fit: contain;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: clamp(14px, 3vw, 30px);
}

.site-nav a,
.site-nav button {
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    padding: 0;
    color: #334f64;
    background: transparent;
    font-size: 0.96rem;
    font-weight: 700;
    font-family: inherit;
    text-decoration: none;
    text-shadow: 0 1px 12px rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: color 180ms ease, transform 180ms ease;
}

.site-nav a:hover,
.site-nav button:hover {
    color: var(--green);
    transform: translateY(-1px);
}

.hero {
    position: relative;
    min-height: 100svh;
    overflow: hidden;
    background-image:
        linear-gradient(90deg, rgba(26, 41, 49, 0.16), rgba(26, 41, 49, 0.02) 36%, rgba(26, 41, 49, 0.08)),
        url("../images/background2.png");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}

.hero-lockup {
    position: absolute;
    left: clamp(390px, 41vw, 690px);
    top: 46%;
    z-index: 2;
    display: grid;
    justify-items: center;
    gap: 12px;
    transform: translate(-50%, -50%);
}

.hero-identity {
    width: clamp(360px, 38vw, 500px);
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: clamp(14px, 2vw, 18px);
    padding: 12px 18px 12px 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.48);
    border-radius: 999px;
    background:
        linear-gradient(135deg, rgba(245, 251, 240, 0.64), rgba(221, 239, 219, 0.34)),
        rgba(255, 255, 255, 0.18);
    box-shadow:
        0 18px 48px rgba(30, 44, 48, 0.14),
        inset 0 1px 0 rgba(255, 255, 255, 0.46);
    text-align: left;
    user-select: none;
    backdrop-filter: blur(16px) saturate(1.1);
    -webkit-backdrop-filter: blur(16px) saturate(1.1);
    --unlock-progress: 0;
}

.hero h1 {
    margin: 0;
    color: #254b45;
    font-size: clamp(2.2rem, 4vw, 3.5rem);
    font-weight: 800;
    line-height: 0.92;
    letter-spacing: 0;
    text-shadow: 0 1px 18px rgba(255, 255, 255, 0.5);
    transition: filter 240ms ease, opacity 240ms ease;
    white-space: nowrap;
}

.hero-nameplate {
    flex: 1 1 auto;
    min-width: 0;
    display: grid;
    justify-items: center;
    gap: 6px;
    padding: 0 18px 0 4px;
    pointer-events: none;
}

.hero-credit {
    margin: 0;
    display: inline-flex;
    align-items: baseline;
    gap: 0.32em;
    color: #ffffff;
    font-size: clamp(1.18rem, 1.9vw, 1.48rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: 0;
    text-align: center;
    transform: none;
}

.hero-credit a {
    text-decoration: none;
    transition:
        color 180ms ease,
        transform 180ms ease;
}

.hero-credit a:hover {
    transform: translateY(-1px);
}

.hero-credit a:focus-visible {
    border-radius: 4px;
    outline: 2px solid rgba(255, 255, 255, 0.82);
    outline-offset: 3px;
}

.credit-codex {
    display: inline-block;
    color: #bcead9;
}

.credit-codex:hover,
.credit-codex:focus-visible {
    color: #d5f7ea;
}

.credit-gemini {
    display: inline-block;
    color: transparent;
    background: linear-gradient(
        92deg,
        #f27f61 0%,
        #ffd76a 22%,
        #93dc83 40%,
        #62c9f2 58%,
        #8d87f6 78%,
        #f59bd0 100%
    );
    background-size: 180% 100%;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.credit-gemini:hover,
.credit-gemini:focus-visible {
    background-position: 100% 50%;
}

.avatar-frame {
    --unlock-x: 0px;
    width: clamp(82px, 8vw, 104px);
    aspect-ratio: 1;
    position: relative;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    border: 2px solid rgba(255, 255, 255, 0.96);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.78);
    box-shadow:
        0 12px 24px rgba(30, 44, 48, 0.15),
        inset 0 0 0 6px rgba(255, 255, 255, 0.28);
    cursor: grab;
    touch-action: none;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transform: translateX(var(--unlock-x));
    transition: transform 260ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.avatar-frame img {
    width: 82%;
    height: 82%;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-frame:hover {
    border-color: rgba(255, 255, 255, 0.98);
    box-shadow:
        0 24px 50px rgba(30, 44, 48, 0.25),
        0 0 28px rgba(255, 255, 255, 0.48),
        inset 0 0 0 8px rgba(255, 255, 255, 0.2);
    transform: translateX(var(--unlock-x)) scale(1.1) rotate(4deg);
}

.avatar-frame:focus-visible {
    outline: 3px solid rgba(63, 155, 92, 0.42);
    outline-offset: 4px;
}

.hero-identity.is-dragging .avatar-frame {
    cursor: grabbing;
    transition: border-color 220ms ease, box-shadow 220ms ease;
}

.hero-identity.is-dragging .avatar-frame,
.hero-identity.is-dragging .avatar-frame:hover,
.hero-identity.is-unlocked .avatar-frame,
.hero-identity.is-unlocked .avatar-frame:hover {
    transform: translateX(var(--unlock-x)) scale(1.04);
}

.hero-identity.is-dragging h1 {
    transition: none;
}

.hero-fade {
    position: absolute;
    right: 0;
    bottom: -4px;
    left: 0;
    height: min(34vh, 340px);
    background: linear-gradient(
        180deg,
        rgba(243, 250, 249, 0) 0%,
        rgba(232, 247, 242, 0.16) 22%,
        rgba(232, 247, 242, 0.52) 58%,
        rgba(243, 250, 249, 0.9) 86%,
        var(--page) 100%
    );
}

.projects-section {
    width: min(960px, calc(100% - 36px));
    margin: 0 auto;
    padding: clamp(42px, 6vw, 64px) 0 clamp(28px, 5vw, 48px);
}

h2 {
    margin: 0;
    font-size: clamp(2.1rem, 5vw, 3.4rem);
    line-height: 1;
    letter-spacing: 0;
}

.project-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 12px;
    margin: 0 auto;
}

.project-card {
    width: calc((100% - 36px) / 4);
    min-height: 86px;
    display: grid;
    align-content: center;
    gap: 6px;
    padding: 13px 14px;
    border: 1px solid rgba(43, 55, 58, 0.11);
    border-radius: var(--radius);
    background: var(--panel);
    box-shadow: 0 14px 32px rgba(35, 45, 48, 0.09);
    font: inherit;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.project-card:hover {
    border-color: rgba(47, 119, 103, 0.32);
    box-shadow: var(--shadow);
    transform: translateY(-3px);
}

.project-card span {
    color: var(--gold);
    font-size: 0.8rem;
    font-weight: 800;
}

.project-card strong {
    color: var(--ink);
    font-size: 1.05rem;
    line-height: 1.28;
}

.guestbook-layout {
    display: grid;
    grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
    gap: 14px;
    align-items: stretch;
}

.guestbook-form,
.messages-panel {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel-strong);
    box-shadow: 0 14px 36px rgba(35, 45, 48, 0.09);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.guestbook-form {
    display: grid;
    gap: 9px;
    padding: 18px;
}

.guestbook-form label {
    color: var(--ink);
    font-size: 0.88rem;
    font-weight: 800;
}

.guestbook-form input,
.guestbook-form textarea {
    width: 100%;
    border: 1px solid rgba(43, 55, 58, 0.16);
    border-radius: var(--radius);
    padding: 11px 12px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.76);
    font: inherit;
    outline: none;
    resize: vertical;
}

.guestbook-form input:focus,
.guestbook-form textarea:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(47, 119, 103, 0.14);
}

.button {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--radius);
    padding: 0 16px;
    color: #ffffff;
    background: var(--green);
    font: inherit;
    font-weight: 800;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: transform 180ms ease, background 180ms ease, opacity 180ms ease;
}

.button:hover {
    background: #246759;
    transform: translateY(-2px);
}

.button:disabled {
    cursor: wait;
    opacity: 0.72;
    transform: none;
}

.form-status {
    min-height: 1.5em;
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.form-status.is-error {
    color: #a33f33;
}

.messages-panel {
    height: 100%;
    min-height: 100%;
    max-height: 410px;
    overflow: auto;
    padding: 10px;
}

.messages-list {
    display: grid;
    gap: 9px;
}

.message-item {
    display: grid;
    gap: 5px;
    padding: 12px;
    border: 1px solid rgba(43, 55, 58, 0.09);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.62);
}

.message-item header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}

.message-item strong {
    overflow-wrap: anywhere;
}

.message-item time {
    min-width: max-content;
    color: var(--muted);
    font-size: 0.78rem;
}

.message-item p {
    margin: 0;
    color: var(--muted);
    overflow-wrap: anywhere;
}

.empty-message {
    margin: 0;
    padding: 15px;
    color: var(--muted);
}

.site-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 0;
    padding: 20px 18px 28px;
    color: #5e718b;
    background: transparent;
    font-size: 0.96rem;
}

.site-footer button {
    border: 0;
    padding: 0;
    color: inherit;
    background: transparent;
    font: inherit;
    text-decoration: none;
    cursor: pointer;
}

.site-footer button:hover {
    color: #334f64;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(22, 31, 35, 0.42);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-overlay[hidden] {
    display: none;
}

.guestbook-modal {
    position: relative;
    width: min(860px, 100%);
    max-height: min(760px, calc(100vh - 48px));
    overflow: auto;
    padding: clamp(22px, 4vw, 34px);
    border: 1px solid rgba(255, 255, 255, 0.42);
    border-radius: var(--radius);
    background: rgba(247, 251, 245, 0.93);
    box-shadow: 0 28px 80px rgba(22, 31, 35, 0.26);
}

.guestbook-modal h2 {
    margin-bottom: 22px;
}

.tool-modal {
    position: relative;
    container-type: inline-size;
    width: min(520px, 100%);
    max-height: min(680px, calc(100vh - 48px));
    overflow: auto;
    padding: clamp(22px, 4vw, 32px);
    border: 1px solid rgba(255, 255, 255, 0.42);
    border-radius: var(--radius);
    background: rgba(247, 251, 245, 0.94);
    box-shadow: 0 28px 80px rgba(22, 31, 35, 0.26);
}

.tool-modal-kicker {
    margin: 0 0 10px;
    color: var(--gold);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.08em;
}

.tool-modal h2 {
    margin: 0;
    padding-right: 36px;
    font-size: clamp(1.28rem, 5.2cqw, 1.95rem);
    line-height: 1.05;
    white-space: nowrap;
}

.tool-meta-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 18px 0 0;
}

.tool-meta-item {
    min-height: 30px;
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(43, 55, 58, 0.1);
    border-radius: 999px;
    padding: 0 10px;
    color: #426163;
    background: rgba(255, 255, 255, 0.64);
    font-size: 0.85rem;
    font-weight: 800;
}

.tool-feature-list {
    display: grid;
    gap: 10px;
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}

.tool-feature-list li {
    border: 1px solid rgba(43, 55, 58, 0.1);
    border-radius: var(--radius);
    padding: 12px 13px;
    color: #465d60;
    background: rgba(255, 255, 255, 0.64);
}

.tool-notice {
    margin: 16px 0 0;
    border-left: 3px solid var(--rose);
    padding: 10px 12px;
    color: #6b4445;
    background: rgba(255, 244, 243, 0.86);
    font-size: 0.92rem;
}

.tool-download-button {
    width: 100%;
    margin-top: 18px;
    overflow-wrap: anywhere;
}

.modal-close {
    position: absolute;
    top: 14px;
    right: 16px;
    width: 36px;
    height: 36px;
    border: 0;
    border-radius: 50%;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.58);
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
}

.modal-close:hover {
    color: var(--ink);
    background: rgba(255, 255, 255, 0.86);
}

@media (max-width: 900px) {
    .hero {
        background-position: 52% center;
    }

    .hero-lockup {
        left: 43%;
        top: 48%;
    }

    .guestbook-layout {
        grid-template-columns: 1fr;
    }

    .project-card {
        width: calc((100% - 12px) / 2);
    }
}

@media (max-width: 720px) {
    .site-header {
        align-items: center;
        flex-direction: row;
        gap: 10px;
        padding: 14px 20px;
    }

    .site-nav {
        flex: 1 1 auto;
        justify-content: flex-end;
        min-width: 0;
    }

    .site-nav a,
    .site-nav button {
        font-size: 0.9rem;
    }

    .hero {
        background-position: 57% center;
    }

    .hero::before {
        position: absolute;
        inset: 0;
        content: "";
        background: linear-gradient(180deg, rgba(22, 38, 45, 0.22), rgba(22, 38, 45, 0.04) 45%, rgba(22, 38, 45, 0.1));
    }

    .hero-lockup {
        left: 50%;
        top: 42%;
        width: min(320px, calc(100% - 48px));
    }

    .hero-identity {
        width: 100%;
        justify-content: flex-start;
        padding: 12px;
    }

    .hero h1 {
        font-size: clamp(1.7rem, 8vw, 2.25rem);
    }

    .hero-credit {
        font-size: 1.08rem;
    }

    .project-card {
        width: 100%;
        min-height: 96px;
    }

    .modal-overlay[data-guestbook-modal] {
        align-items: flex-start;
        padding-top: 54px;
    }

    .modal-overlay[data-guestbook-modal] .guestbook-modal {
        max-height: calc(100svh - 72px);
    }
}

@media (max-width: 520px) {
    .projects-section,
    .guestbook-modal,
    .tool-modal {
        width: min(100% - 28px, 860px);
    }

    .message-item header {
        align-items: flex-start;
        flex-direction: column;
    }

    .modal-overlay {
        padding: 14px;
    }

    .guestbook-modal,
    .tool-modal {
        max-height: calc(100vh - 28px);
        padding: 20px;
    }
}