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

:root {
    --main: #2f6fd0;
    --main-dark: #24559f;
    --main-soft: #eef4fc;
    --text: #1f2430;
    --text-sub: #667085;
    --text-mute: #9aa1ab;
    --border: #e4e7eb;
    --border-dark: #cdd3da;
    --bg: #f4f5f7;
    --surface: #ffffff;
    --danger: #d64545;
    --danger-dark: #b53838;
    --danger-soft: #fdeded;
    --radius: 6px;
    --control-h: 38px;
    --card-w: 380px;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: "Malgun Gothic", "맑은 고딕", "Apple SD Gothic Neo", system-ui, -apple-system, sans-serif;
    font-size: 15px;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
}

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

a:hover {
    color: var(--main);
}

h1 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 24px;
    height: 58px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

header .brand a {
    font-size: 1.12rem;
    font-weight: 800;
    color: var(--main);
    letter-spacing: -0.02em;
}

header nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

header nav form {
    margin: 0;
    display: flex;
}

.user-name {
    font-size: 0.88rem;
    color: var(--text-sub);
}

.content {
    flex: 1;
    width: 100%;
    max-width: 880px;
    margin: 32px auto;
    padding: 0 20px;
}

footer {
    padding: 18px 20px;
    font-size: 0.8rem;
    color: var(--text-mute);
    text-align: center;
    border-top: 1px solid var(--border);
}

button,
.btn-link,
.write-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: var(--control-h);
    padding: 0 16px;
    font-family: inherit;
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

button,
.write-btn {
    color: #fff;
    background: var(--main);
}

button:hover:not(:disabled),
.write-btn:hover {
    color: #fff;
    background: var(--main-dark);
}

.btn-link,
.btn-sub {
    color: var(--text-sub);
    background: var(--surface);
    border-color: var(--border-dark);
}

.btn-link:hover,
.btn-sub:hover:not(:disabled) {
    color: var(--main);
    background: var(--main-soft);
    border-color: var(--main);
}

.btn-danger {
    background: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-dark);
}

button:disabled {
    color: var(--text-mute);
    background: #eceef1;
    border-color: transparent;
    cursor: not-allowed;
}

header nav .btn-link,
header nav .btn-sub {
    height: 32px;
    padding: 0 12px;
    font-size: 0.86rem;
    font-weight: 500;
}

label {
    display: block;
    margin: 15px 0 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-sub);
}

input[type="text"],
input[type="password"],
input[type="email"],
select {
    height: var(--control-h);
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea,
select {
    width: 100%;
    padding: 0 12px;
    font-family: inherit;
    font-size: 0.94rem;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius);
    transition: border-color 0.15s, box-shadow 0.15s;
}

select {
    padding-right: 8px;
    cursor: pointer;
}

input::placeholder,
textarea::placeholder {
    color: var(--text-mute);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--main);
    box-shadow: 0 0 0 3px rgba(47, 111, 208, 0.13);
}

input:disabled,
textarea:disabled {
    color: var(--text-mute);
    background: #f2f3f5;
    cursor: not-allowed;
}

textarea {
    min-height: 280px;
    padding: 11px 12px;
    line-height: 1.7;
    resize: vertical;
}

.auth-title {
    max-width: var(--card-w);
    margin: 0 auto 6px;
    text-align: center;
}

.form-desc {
    max-width: var(--card-w);
    margin: 0 auto 16px;
    font-size: 0.89rem;
    color: var(--text-sub);
    text-align: center;
}

.msg-error {
    max-width: var(--card-w);
    margin: 0 auto 14px;
    padding: 9px 13px;
    font-size: 0.88rem;
    color: var(--danger-dark);
    background: var(--danger-soft);
    border: 1px solid #f4cbcb;
    border-radius: var(--radius);
    text-align: center;
}

.auth-form {
    max-width: var(--card-w);
    margin: 0 auto;
    padding: 6px 26px 26px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.auth-form > button[type="submit"] {
    width: 100%;
    height: 42px;
    margin-top: 22px;
    font-size: 0.95rem;
}

.form-foot {
    margin-top: 18px;
    font-size: 0.86rem;
    color: var(--text-sub);
    text-align: center;
}

.form-foot a {
    color: var(--main);
    font-weight: 600;
}

.pw-wrap {
    position: relative;
}

.pw-wrap input {
    padding-right: 42px;
}

.pw-toggle {
    position: absolute;
    top: 50%;
    right: 4px;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    padding: 0;
    color: var(--text-mute);
    background: transparent;
    border: none;
    border-radius: 4px;
}

.pw-toggle svg {
    width: 18px;
    height: 18px;
    display: block;
}

.pw-toggle .ico-eye-off {
    display: none;
}

.pw-toggle.on .ico-eye {
    display: none;
}

.pw-toggle.on .ico-eye-off {
    display: block;
}

.pw-toggle:hover:not(:disabled) {
    color: var(--main);
    background: var(--main-soft);
}

.pw-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px rgba(47, 111, 208, 0.35);
}

.pw-match {
    min-height: 1.25em;
    margin-top: 5px;
    font-size: 0.81rem;
}

.pw-match.ok {
    color: #1d7a4d;
}

.pw-match.no {
    color: var(--danger);
}

#otp-timer {
    display: block;
    margin-top: 8px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--main);
    text-align: right;
}

#otp-timer.expired {
    color: var(--danger);
}

.resend-form {
    max-width: var(--card-w);
    margin: 10px auto 0;
}

.resend-form button {
    width: 100%;
}

.post-form {
    padding: 4px 24px 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 22px;
}

.board-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.board-table {
    width: 100%;
    background: var(--surface);
    border-collapse: collapse;
    border-top: 2px solid var(--text);
    border-bottom: 1px solid var(--border-dark);
    table-layout: fixed;
}

.board-table th,
.board-table td {
    padding: 12px 10px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.board-table th {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-sub);
    background: #fafbfc;
}

.board-table tbody tr:hover {
    background: #f8fafd;
}

.board-table .col-title {
    text-align: left;
    padding-left: 14px;
}

.board-table .col-title a:hover {
    text-decoration: underline;
}

.board-table .empty-row {
    padding: 44px 10px;
    font-size: 0.92rem;
    color: var(--text-mute);
    white-space: normal;
}

.th_id { width: 68px; }
.th_author { width: 116px; }
.th_calendar { width: 92px; }
.th_views { width: 76px; }

.paginate {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 5px;
    margin: 24px 0;
}

.paginate a,
.paginate .current {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 9px;
    font-size: 0.88rem;
    font-weight: 500;
    background: var(--surface);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius);
}

.paginate a:hover {
    color: var(--main);
    background: var(--main-soft);
    border-color: var(--main);
}

.paginate .current {
    color: #fff;
    background: var(--main);
    border-color: var(--main);
}

.ellipsis {
    padding: 0 2px;
    color: var(--text-mute);
}

.search_form {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 26px;
}

.search_form select {
    flex: 0 0 108px;
    width: 108px;
}

.search_form input[type="text"] {
    flex: 0 1 300px;
    width: auto;
    min-width: 0;
}

.search_form button {
    flex: 0 0 auto;
    padding: 0 22px;
}

.post-view {
    padding: 26px 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.post-view h1 {
    font-size: 1.38rem;
    margin-bottom: 13px;
    word-break: break-word;
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    padding-bottom: 15px;
    font-size: 0.85rem;
    color: var(--text-sub);
    border-bottom: 1px solid var(--border);
}

.post-meta .author {
    font-weight: 600;
    color: var(--text);
}

.tooltip-container {
    position: relative;
    cursor: help;
    border-bottom: 1px dotted var(--text-mute);
}

.tooltip-text {
    position: absolute;
    bottom: 135%;
    left: 0;
    z-index: 10;
    padding: 5px 9px;
    font-size: 0.78rem;
    color: #fff;
    white-space: nowrap;
    background: #333a45;
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s;
}

.tooltip-container:hover .tooltip-text {
    opacity: 1;
    visibility: visible;
}

.post-content {
    min-height: 200px;
    padding: 24px 2px;
    white-space: pre-wrap;
    word-break: break-word;
}

.post-actions {
    display: flex;
    gap: 7px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}

.post-actions form {
    margin: 0;
    display: flex;
}

.nav-table {
    width: 100%;
    margin-top: 22px;
    background: var(--surface);
    border-collapse: collapse;
    border-top: 1px solid var(--border-dark);
    border-bottom: 1px solid var(--border);
    table-layout: fixed;
}

.nav-table th,
.nav-table td {
    padding: 12px 14px;
    font-size: 0.9rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.nav-table tr:last-child th,
.nav-table tr:last-child td {
    border-bottom: none;
}

.nav-table th {
    width: 108px;
    font-weight: 600;
    color: var(--text-sub);
    background: #fafbfc;
}

.nav-table td {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-table td a:hover {
    text-decoration: underline;
}

.nav-table .empty {
    font-size: 0.88rem;
    color: var(--text-mute);
}

.error-page {
    padding: 70px 20px;
    text-align: center;
}

.error-page h1 {
    font-size: 3.4rem;
    line-height: 1.2;
    color: var(--main);
}

.error-page p {
    margin: 12px 0 24px;
    color: var(--text-sub);
}

@media (max-width: 640px) {
    body { font-size: 14px; }

    header {
        height: 52px;
        padding: 0 15px;
    }

    header .brand a { font-size: 1.02rem; }

    .user-name { display: none; }

    .content {
        margin: 22px auto;
        padding: 0 14px;
    }

    .auth-title,
    .form-desc,
    .msg-error,
    .auth-form,
    .resend-form {
        max-width: none;
    }

    .board-table th,
    .board-table td {
        padding: 10px 6px;
        font-size: 0.88rem;
    }

    .th_views,
    .board-table tbody td:nth-child(5) {
        display: none;
    }

    .th_author { width: 92px; }
    .th_calendar { width: 76px; }

    .search_form select {
        flex: 0 0 92px;
        width: 92px;
    }

    .search_form input[type="text"] {
        flex: 1 1 auto;
    }

    .search_form button {
        padding: 0 16px;
    }

    .post-view {
        padding: 20px 18px;
    }

    .post-actions {
        flex-wrap: wrap;
    }

    .nav-table th {
        width: 84px;
    }

    textarea {
        min-height: 220px;
    }
}