:root {
    --app-bg-1: #f7f5ef;
    --app-bg-2: #eef5f6;
    --app-bg-3: #fcfaf5;
    --app-surface: rgba(255, 255, 255, 0.9);
    --app-surface-strong: #ffffff;
    --app-surface-soft: #f6f8fb;
    --app-text: #213047;
    --app-text-subtle: #5b6980;
    --app-border: #d8e3ec;
    --app-border-strong: #c2d2e0;
    --app-primary: #0f7c82;
    --app-primary-strong: #0b5f64;
    --app-accent: #f08a39;
    --app-danger: #d64545;
    --app-success: #1f9960;
    --app-shadow: 0 10px 30px rgba(28, 48, 77, 0.1);
    --app-radius-sm: 10px;
    --app-radius-md: 14px;
    --app-radius-lg: 18px;
    --app-font-sans: "Noto Sans KR", sans-serif;
    --app-font-display: "Sora", "Noto Sans KR", sans-serif;
    --bs-primary: var(--app-primary);
    --bs-secondary: #6f8298;
    --bs-link-color: #0c7680;
    --bs-link-hover-color: #0a5d64;
}

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

html,
body {
    min-height: 100%;
}

body {
    position: relative;
    margin: 0;
    font-family: var(--app-font-sans);
    color: var(--app-text);
    background:
            radial-gradient(1200px 580px at 10% -10%, #ffffff 0%, transparent 60%),
            radial-gradient(780px 420px at 95% 0%, rgba(174, 216, 220, 0.52) 0%, transparent 66%),
            linear-gradient(160deg, var(--app-bg-1) 0%, var(--app-bg-2) 55%, var(--app-bg-3) 100%);
    line-height: 1.6;
    animation: pageFadeIn 0.45s ease-out;
}

body::before,
body::after {
    content: "";
    position: fixed;
    z-index: -1;
    border-radius: 999px;
    pointer-events: none;
    filter: blur(64px);
    opacity: 0.45;
}

body::before {
    width: 320px;
    height: 320px;
    top: -120px;
    right: -100px;
    background: #b2e8e5;
}

body::after {
    width: 240px;
    height: 240px;
    bottom: -100px;
    left: -80px;
    background: #ffe0c2;
}

h1,
h2,
h3,
h4,
h5,
h6,
.display-1,
.display-2,
.display-3,
.display-4,
.display-5,
.display-6,
.card-header,
.navbar-brand,
.btn {
    font-family: var(--app-font-display);
    letter-spacing: -0.01em;
}

a {
    color: var(--bs-link-color);
    text-decoration: none;
}

a:hover {
    color: var(--bs-link-hover-color);
}

.container {
    width: min(100% - 1.6rem, 1160px);
}

.container.app-page {
    padding-bottom: 2rem;
}

.app-intro {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.1rem;
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius-md);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(242, 249, 251, 0.86));
    box-shadow: 0 8px 22px rgba(24, 56, 88, 0.08);
}

.app-intro h1,
.app-intro h2,
.app-intro .h4 {
    color: #1b2d47;
    margin-bottom: 0.4rem;
}

.app-intro p {
    margin-bottom: 0;
}

.app-intro-actions {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.app-narrow-xs {
    max-width: 520px;
}

.app-narrow-sm {
    max-width: 620px;
}

.app-narrow-md {
    max-width: 820px;
}

.app-narrow-lg {
    max-width: 980px;
}

.app-navbar {
    margin: 0.65rem auto 0;
    width: min(100% - 1.4rem, 1160px);
    border: 1px solid rgba(186, 204, 221, 0.72);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.86);
    box-shadow: 0 10px 30px rgba(17, 37, 63, 0.1);
    backdrop-filter: blur(12px);
}

.app-navbar .container {
    width: 100%;
    max-width: 100%;
    padding-left: 1rem;
    padding-right: 1rem;
}

.app-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    color: var(--app-text);
}

.app-brand:hover {
    color: var(--app-text);
}

.app-brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    color: #fff;
    background: linear-gradient(140deg, var(--app-primary), #44aeb3);
}

.app-brand-title {
    font-size: 1rem;
    line-height: 1;
    font-weight: 700;
}

.app-brand-subtitle {
    margin-top: 0.1rem;
    font-family: var(--app-font-sans);
    font-size: 0.67rem;
    font-weight: 500;
    color: var(--app-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.app-navbar .nav-link {
    color: #3a4a63;
    border-radius: 999px;
    padding: 0.45rem 0.82rem;
    transition: all 0.2s ease;
}

.app-navbar .nav-link:hover {
    color: #102942;
    background: rgba(15, 124, 130, 0.09);
}

.app-navbar .nav-link.active {
    color: #fff;
    background: var(--app-primary);
}

.app-user-chip {
    padding: 0.34rem 0.62rem;
    border: 1px solid var(--app-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.9);
}

.app-user-name {
    color: var(--app-text);
    font-weight: 600;
}

.app-navbar .navbar-toggler {
    border: 1px solid var(--app-border-strong);
    border-radius: 12px;
}

.app-navbar .navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem rgba(15, 124, 130, 0.18);
}

.app-navbar .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(34, 52, 77, 0.88)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.app-flash {
    position: relative;
    z-index: 2;
}

.app-flash .alert {
    border: 1px solid transparent;
    border-radius: var(--app-radius-md);
    box-shadow: var(--app-shadow);
    font-size: 0.94rem;
}

.text-muted {
    color: var(--app-text-subtle) !important;
}

.card {
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius-lg);
    background: linear-gradient(170deg, var(--app-surface-strong) 0%, var(--app-surface) 100%);
    box-shadow: var(--app-shadow);
    overflow: hidden;
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 36px rgba(20, 46, 73, 0.14);
}

.card .card-header {
    border-bottom: 1px solid var(--app-border);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(243, 248, 250, 0.96));
    color: #1c2d47;
    font-size: 0.98rem;
    font-weight: 700;
    padding: 0.86rem 1rem;
}

.card .card-body {
    color: var(--app-text);
}

.row.g-4 > [class*="col"] .card,
.row.g-3 > [class*="col"] .card {
    animation: cardRise 0.5s ease both;
}

.row.g-4 > [class*="col"]:nth-child(2) .card,
.row.g-3 > [class*="col"]:nth-child(2) .card {
    animation-delay: 0.05s;
}

.row.g-4 > [class*="col"]:nth-child(3) .card,
.row.g-3 > [class*="col"]:nth-child(3) .card {
    animation-delay: 0.1s;
}

.form-label,
.form-check-label,
label {
    color: #263650;
    font-weight: 600;
}

.form-control,
.form-select,
.form-check-input {
    border-radius: var(--app-radius-sm);
    border: 1px solid var(--app-border-strong);
    background: #fff;
    color: var(--app-text);
}

.form-control::placeholder,
.form-select::placeholder {
    color: #8d99ac;
}

.form-control:focus,
.form-select:focus,
.form-check-input:focus {
    border-color: #41a2a7;
    box-shadow: 0 0 0 0.2rem rgba(64, 161, 167, 0.2);
}

.form-check-input:checked {
    border-color: var(--app-primary);
    background-color: var(--app-primary);
}

.form-text {
    color: #6d7d95;
}

.btn {
    border-radius: 12px;
    font-weight: 600;
    border-width: 1px;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:focus-visible {
    box-shadow: 0 0 0 0.2rem rgba(64, 161, 167, 0.28);
}

.btn-primary {
    border-color: transparent;
    background: linear-gradient(135deg, var(--app-primary), #34a0a7);
    color: #fff;
    box-shadow: 0 8px 20px rgba(13, 117, 122, 0.28);
}

.btn-primary:hover,
.btn-primary:focus {
    border-color: transparent;
    background: linear-gradient(135deg, var(--app-primary-strong), #2f8f95);
    color: #fff;
}

.btn-warning {
    border-color: transparent;
    color: #fff;
    background: linear-gradient(140deg, var(--app-accent), #f4a24b);
}

.btn-warning:hover,
.btn-warning:focus {
    border-color: transparent;
    color: #fff;
    background: linear-gradient(140deg, #d87424, #eb9437);
}

.btn-outline-light {
    border-color: #9fb1c4;
    color: #40526b;
    background: rgba(255, 255, 255, 0.65);
}

.btn-outline-light:hover,
.btn-outline-light:focus {
    border-color: #7a8ea6;
    color: #1f2f47;
    background: rgba(255, 255, 255, 0.94);
}

.btn-outline-secondary {
    border-color: #9db1c4;
    color: #3f4f67;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
    color: #223349;
    background: #e8eef4;
    border-color: #8aa1b9;
}

.btn-outline-dark {
    border-color: #8da3b8;
    color: #344a62;
}

.btn-outline-dark:hover,
.btn-outline-dark:focus {
    border-color: #748ca3;
    color: #1f3349;
    background: #e9f0f6;
}

.alert {
    border-radius: var(--app-radius-md);
}

.alert-danger {
    color: #8f2e2e;
    background: #ffe9e9;
    border-color: #f5c5c5;
}

.alert-warning {
    color: #7b4b1c;
    background: #fff3e2;
    border-color: #f0d1ab;
}

.alert-success {
    color: #1a6f48;
    background: #e7f8ef;
    border-color: #bde9d0;
}

.alert-info {
    color: #20546d;
    background: #e8f5fb;
    border-color: #bfdeec;
}

.badge {
    font-weight: 700;
    letter-spacing: 0.01em;
}

.list-group-item {
    color: var(--app-text);
    border-color: #dde7ef;
    background: rgba(255, 255, 255, 0.8);
}

.list-group-item-action:hover,
.list-group-item-action:focus {
    color: var(--app-text);
    background: #f3f8fb;
}

.list-group-item.active {
    background: linear-gradient(135deg, #0f7c82, #2ea2aa);
    border-color: transparent;
    color: #fff;
}

.list-group-item.active .text-muted {
    color: rgba(255, 255, 255, 0.82) !important;
}

.sidebar-turns a {
    text-decoration: none;
}

.sidebar-turns .active {
    border-left: 0;
}

.accordion-item {
    border-radius: var(--app-radius-md);
    border-color: #dde6ef;
    overflow: hidden;
}

.accordion-button {
    color: var(--app-text);
    background: #fbfdff;
}

.accordion-button:not(.collapsed) {
    color: #12334c;
    background: #ebf5fa;
}

.accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(64, 161, 167, 0.18);
}

.card .text-light,
.list-group .text-light,
.accordion .text-light {
    color: var(--app-text) !important;
}

.border {
    border-color: #dbe4ec !important;
}

pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    border-radius: var(--app-radius-sm);
    border: 1px solid #e2e9f0;
    background: #f8fbfd;
    color: #203046;
    padding: 0.85rem 0.92rem;
    font-family: "Noto Sans KR", sans-serif;
    font-size: 0.92rem;
}

.expected-points-pre {
    border-color: #d2e2ea;
    background: #eef9fb;
    color: #194157;
}

details summary {
    cursor: pointer;
}

.table {
    --bs-table-bg: transparent;
    --bs-table-striped-bg: rgba(15, 124, 130, 0.03);
    --bs-table-color: var(--app-text);
}

.table > :not(caption) > * > * {
    border-color: #e1e9f0;
}

.text-danger {
    color: var(--app-danger) !important;
}

.text-success {
    color: var(--app-success) !important;
}

@media (max-width: 991.98px) {
    .app-navbar {
        width: calc(100% - 1rem);
        border-radius: 18px;
    }

    .app-navbar .navbar-collapse {
        margin-top: 0.6rem;
        padding-top: 0.6rem;
        border-top: 1px solid #dde6ef;
    }

    .app-navbar .nav-link {
        padding-left: 0.25rem;
        padding-right: 0.25rem;
    }

    .app-user-chip {
        margin-top: 0.35rem;
    }
}

@media (max-width: 767.98px) {
    .container {
        width: calc(100% - 1rem);
    }

    .app-intro {
        padding: 0.9rem;
        flex-direction: column;
    }

    .app-intro-actions {
        justify-content: flex-start;
    }

    .card .card-header {
        font-size: 0.94rem;
    }

    .btn {
        font-size: 0.92rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}

@keyframes pageFadeIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes cardRise {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}