:root {
    --color-bg: #f5f5f5;
    --color-card: #ffffff;
    --color-border: #dddddd;
    --color-border-light: #e5e5e5;
    --color-table-head: #f0f0f0;
    --color-code-bg: #f7f7f7;

    --color-text: #222222;
    --color-muted: #666666;
    --color-strong: #111111;

    --color-primary: #444444;
    --color-primary-hover: #222222;

    --color-accepted: #009b72;
    --color-error: #e03131;
    --color-warning: #e67700;
    --color-purple: #7048e8;
    --color-pending: #8a6d3b;
    --color-system: #666666;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: Arial, "Noto Sans KR", sans-serif;
    font-size: 15px;
}

a {
    color: #333;
    text-decoration: none;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px;
}

.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 7px;
    padding: 20px;
}

.page-title {
    margin: 0 0 18px;
    font-size: 26px;
}

.header {
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo,
.site-brand {
    color: var(--color-text);
    text-decoration: none;
}

.site-brand {
    display: flex;
    flex-direction: column;
    gap: 2px;
    line-height: 1;
}

.site-brand-main {
    font-size: 28px;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.site-brand-sub {
    color: #355070;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.14em;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 14px;
}

.nav a {
    color: var(--color-muted);
    padding-bottom: 4px;
}

.nav a.active {
    color: var(--color-strong);
    font-weight: 800;
    border-bottom: 2px solid #555;
}

.auth-area {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    white-space: nowrap;
}

.login-button {
    padding: 7px 11px;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    background: #fff;
    color: var(--color-text);
    font-weight: 800;
}

.button-primary,
.button-primary-link,
.button-secondary-link {
    display: inline-block;
    padding: 9px 16px;
    border-radius: 5px;
    font-size: 14px;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
}

.button-primary,
.button-primary-link {
    border: 0;
    background: var(--color-primary);
    color: #fff;
}

.button-secondary-link {
    border: 1px solid var(--color-border);
    background: #f8f9fa;
    color: #222;
}

.form-row {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
    font-size: 14px;
}

.form-row label {
    min-width: 90px;
    font-weight: 800;
}

select,
input,
textarea,
button {
    font-family: inherit;
}

input,
select,
textarea {
    border: 1px solid #ccc;
    border-radius: 5px;
}

input,
select {
    padding: 7px 10px;
    background: #fff;
    font-size: 14px;
}

.code-input {
    width: 100%;
    min-height: 360px;
    padding: 12px;
    resize: vertical;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: Consolas, Monaco, monospace;
    font-size: 14px;
    line-height: 1.5;
}

.submit-actions {
    margin-top: 12px;
    text-align: right;
}

.info-table,
.problem-table,
.submission-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

.info-table th,
.info-table td,
.problem-table th,
.problem-table td,
.submission-table th,
.submission-table td {
    padding: 11px 12px;
    border-bottom: 1px solid var(--color-border-light);
    text-align: left;
}

.info-table th,
.problem-table th,
.submission-table th {
    background: var(--color-table-head);
    font-weight: 800;
}

.info-table th {
    width: 160px;
}

.info-table code {
    padding: 2px 5px;
    border-radius: 4px;
    background: #f1f3f5;
    font-family: Consolas, Monaco, monospace;
}

.difficulty {
    font-weight: 800;
}

.difficulty[data-difficulty="Bronze I"],
.difficulty[data-difficulty="Bronze II"],
.difficulty[data-difficulty="Bronze III"],
.difficulty[data-difficulty="Bronze IV"],
.difficulty[data-difficulty="Bronze V"] {
    color: #ad5600;
}

.difficulty[data-difficulty="Silver I"],
.difficulty[data-difficulty="Silver II"],
.difficulty[data-difficulty="Silver III"],
.difficulty[data-difficulty="Silver IV"],
.difficulty[data-difficulty="Silver V"] {
    color: #435f7a;
}

.difficulty[data-difficulty="Gold I"],
.difficulty[data-difficulty="Gold II"],
.difficulty[data-difficulty="Gold III"],
.difficulty[data-difficulty="Gold IV"],
.difficulty[data-difficulty="Gold V"] {
    color: #ec9a00;
}

.problem-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.problem-tags-center {
    justify-content: center;
    margin-top: 10px;
}

.problem-tag {
    display: inline-block;
    padding: 3px 8px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: #f7f7f7;
    color: #444;
    font-size: 12px;
    line-height: 1.4;
    white-space: nowrap;
}

.home-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 18px;
}

.home-title {
    margin: 0 0 10px;
    font-size: 32px;
}

.home-description {
    margin: 0;
    color: var(--color-muted);
    line-height: 1.7;
}

.home-actions {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.home-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-bottom: 18px;
}

.stat-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 20px;
    text-align: center;
}

.stat-value {
    margin-bottom: 6px;
    color: var(--color-strong);
    font-size: 30px;
    font-weight: 900;
}

.stat-label {
    color: var(--color-muted);
    font-size: 14px;
}

.problem-title {
    font-weight: 700;
}

.col-id {
    width: 90px;
    text-align: center;
}

.col-solved {
    width: 56px;
    text-align: center;
}

.col-tags {
    width: 500px;
}

.problem-search-form {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.problem-search-input {
    width: 320px;
    max-width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    font-size: 14px;
}

.problem-search-reset {
    color: var(--color-muted);
    font-size: 14px;
}

.problem-card {
    margin-bottom: 18px;
}

.problem-header {
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 18px;
    margin-bottom: 22px;
}

.problem-title-main {
    margin: 0 0 12px;
    font-size: 30px;
}

.problem-body {
    max-width: 900px;
    margin: 0 auto;
}

.problem-section {
    margin: 28px 0;
}

.problem-section h2 {
    margin: 0 0 12px;
    font-size: 23px;
    border-bottom: 1px solid var(--color-border-light);
    padding-bottom: 6px;
}

.problem-text {
    line-height: 1.75;
    font-size: 16px;
    word-break: keep-all;
}

.problem-text p {
    margin: 0 0 14px;
}

.problem-text code {
    padding: 2px 5px;
    border-radius: 4px;
    background: #f1f3f5;
    font-family: Consolas, Monaco, monospace;
}

.submission-table th,
.submission-table td {
    white-space: nowrap;
}

.submission-table .col-id,
.submission-table .col-problem,
.submission-table .col-lang,
.submission-table .col-time,
.submission-table .col-memory,
.submission-table .col-len {
    text-align: center;
}

.col-problem {
    width: 90px;
}

.col-lang {
    width: 100px;
}

.col-status {
    width: 160px;
}

.col-time {
    width: 100px;
}

.col-memory {
    width: 120px;
}

.col-created {
    width: 180px;
}

.status {
    font-weight: 800;
    font-size: 13px;
}

.status-wrong_answer,
.status-runtime_error,
.status-compile_error,
.status-time_limit_exceeded,
.status-memory_limit_exceeded {
    color: var(--color-error);
}

.submission-detail-card {
    margin-bottom: 18px;
}

.submission-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 24px;
    margin-top: 16px;
}

.submission-meta > div {
    padding: 10px 12px;
    background: #fafafa;
    border: 1px solid var(--color-border-light);
    border-radius: 5px;
}

.meta-label {
    display: inline-block;
    min-width: 82px;
    color: var(--color-muted);
    font-weight: 800;
}

.submission-meta a {
    color: #1f4f7a;
    font-weight: 800;
    line-height: 1.4;
    text-decoration: none;
}

.source-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid var(--color-border-light);
    margin-bottom: 12px;
    padding-bottom: 6px;
}

.source-title-row h1,
.source-title-row h2 {
    margin: 0;
}

.submission-page-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

@media (max-width: 700px) {
    .source-title-row {
    align-items: stretch;
    flex-direction: column;
    }

    .submission-page-actions {
    width: 100%;
    }

    .submission-page-actions .button-secondary-link {
    width: 100%;
    text-align: center;
    }

}

.CodeMirror {
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: Consolas, Monaco, monospace;
    font-size: 14px;
    line-height: 1.5;
}

.CodeMirror-gutters {
    background: #f7f7f7;
    border-right: 1px solid #ddd;
}

.CodeMirror-linenumber {
    color: #999;
}

.cm-keyword {
    color: #444;
    font-weight: 800;
}

.cm-def,
.cm-variable {
    color: #222;
}

.cm-string {
    color: #7a3e3e;
}

.cm-number {
    color: #5c5c5c;
}

.cm-operator {
    color: #333;
}

.CodeMirror-activeline-background {
    background: #f1f1f1;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-top: 20px;
}

.pagination a {
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    background: #fff;
    color: #444;
}

.pagination .page-info {
    color: #555;
}

.error-message-card {
    margin-bottom: 18px;
}

.error-message-card h2 {
    margin: 0 0 12px;
    font-size: 20px;
}

.judge-error-message {
    margin: 0;
    padding: 14px;
    background: #111;
    color: #f1f1f1;
    border-radius: 5px;
    font-family: Consolas, Monaco, monospace;
    font-size: 13px;
    line-height: 1.55;
    white-space: pre-wrap;
    overflow-x: auto;
}

.info-card {
    margin-bottom: 18px;
}

.info-card h2 {
    margin: 0 0 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border-light);
    font-size: 22px;
}

.info-card p {
    margin: 0 0 14px;
    line-height: 1.7;
}

.info-list {
    margin: 0;
    padding-left: 20px;
    line-height: 1.8;
}

.language-picker {
    position: relative;
    min-width: 180px;
}

.language-search {
    width: 220px;
    padding: 7px 10px;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    background: #fff;
    font-size: 14px;
}

.language-options {
    display: none;
    position: absolute;
    z-index: 30;
    top: calc(100% + 4px);
    left: 0;
    width: 220px;
    max-height: 220px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    background: #fff;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

@media (max-width: 800px) {
    .header-inner {
    flex-direction: column;
    align-items: flex-start;
    }

    .header-right {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    }

    .nav,
    .auth-area {
    flex-wrap: wrap;
    }

    .home-hero {
    flex-direction: column;
    align-items: flex-start;
    }

    .home-actions {
    width: 100%;
    flex-direction: column;
    }

    .home-stats {
    grid-template-columns: 1fr;
    }

    .submission-table {
    font-size: 13px;
    }

    .submission-table th,
    .submission-table td {
    padding: 8px 6px;
    }

    .submission-meta {
    grid-template-columns: 1fr;
    }

}

@media (max-width: 700px) {
    .container {
    padding: 18px 12px;
    }

    .card {
    padding: 16px;
    }

    .page-title {
    font-size: 23px;
    }

    .problem-title-main {
    font-size: 25px;
    }

    .problem-search-form {
    align-items: stretch;
    flex-direction: column;
    }

    .problem-search-input,
    .problem-difficulty-select {
    width: 100%;
    }

    .info-table th,
    .info-table td {
    display: block;
    width: 100%;
    }

    .info-table th {
    border-bottom: 0;
    }

    .button-primary-link,
    .button-secondary-link {
    width: 100%;
    text-align: center;
    }

}

.card > form .form-row {
    max-width: 920px;
}

.card > form .form-row input:not([type="checkbox"]),
.card > form .form-row select {
    min-width: 210px;
}

@media (max-width: 700px) {
    .card > form .form-row {
    align-items: stretch;
    flex-direction: column;
    gap: 6px;
    }

    .card > form .form-row label {
    min-width: 0;
    }

    .card > form .form-row input:not([type="checkbox"]),
    .card > form .form-row select {
    width: 100%;
    min-width: 0;
    }

}

.problem-filter-panel {
    margin-bottom: 18px;
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: #fafafa;
}

.problem-filter-summary {
    color: var(--color-strong);
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
    user-select: none;
}

.problem-card {
    padding: 28px 30px;
}

.problem-header {
    margin-bottom: 28px;
    padding-bottom: 22px;
}

.problem-body {
    max-width: 900px;
    margin: 0 auto;
}

.problem-section {
    margin: 30px 0;
}

.problem-section:first-child {
    margin-top: 0;
}

.problem-text {
    color: #111;
    font-size: 16px;
    line-height: 1.85;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.problem-text p {
    margin: 0 0 18px;
}

.problem-text code {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 5px;
    background: #f1f3f5;
    color: #111;
    font-family: Consolas, Monaco, monospace;
    font-size: 0.88em;
    line-height: 1.45;
    vertical-align: baseline;
}

.submit-card .form-row {
    gap: 8px;
    align-items: center;
    margin-bottom: 12px;
}

.submit-card .form-row label {
    min-width: 42px;
    width: 42px;
    font-weight: 900;
}

.submit-card .language-picker {
    width: 220px;
    min-width: 220px;
}

.submit-card .language-search {
    width: 220px;
}

.pagination {
    gap: 6px;
}

.pagination .pagination-page {
    min-width: 34px;
    padding: 6px 9px;
    text-align: center;
}

.pagination .pagination-page.active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: #fff;
    font-weight: 800;
}