:root {
    --bg: #eef5ff;
    --bg-deep: #ddeafc;
    --surface: #ffffff;
    --surface-alt: #f5f8ff;
    --text: #17212d;
    --muted: #5d6d83;
    --primary: #4f7cff;
    --primary-dark: #3158d6;
    --secondary: #1bb7a7;
    --accent: #7c4dff;
    --border: rgba(124, 144, 177, 0.24);
    --shadow: 0 20px 45px rgba(22, 35, 58, 0.12);
    --shadow-soft: 0 12px 28px rgba(79, 124, 255, 0.12);
    --radius: 20px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(circle at top left, rgba(79, 124, 255, 0.18), transparent 28%),
        radial-gradient(circle at right top, rgba(27, 183, 167, 0.15), transparent 22%),
        linear-gradient(135deg, var(--bg), #f7faff 42%, #edf4ff);
    color: var(--text);
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: var(--primary-dark);
}

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    background: rgba(17, 24, 39, 0.82);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #fff;
    box-shadow: 0 12px 25px rgba(15, 23, 42, 0.18);
    backdrop-filter: blur(14px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #fff;
}

.logo span {
    background: rgba(255, 255, 255, 0.08);
    padding: 0.4rem 0.7rem;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.logo img {
    width: 54px;
    height: auto;
    display: block;
    filter: drop-shadow(0 10px 18px rgba(255, 255, 255, 0.12));
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.6rem 0.8rem;
    align-items: center;
}

.nav-links a {
    color: #edf4ff;
    text-decoration: none;
    padding: 0.52rem 0.9rem;
    border-radius: 999px;
    border: 1px solid transparent;
    transition: background-color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
    font-weight: 600;
}

.nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
}

.container {
    padding: 2.2rem 1.25rem 3rem;
    max-width: 1180px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

.page-shell {
    display: block;
}

.alert {
    padding: 0.95rem 1rem;
    margin-bottom: 1rem;
    border-radius: 14px;
    border: 1px solid transparent;
    box-shadow: var(--shadow-soft);
    font-weight: 500;
}

.alert-success {
    background: #ecfdf5;
    color: #166534;
    border-color: #a7f3d0;
}

.alert-error {
    background: #fff1f2;
    color: #b91c1c;
    border-color: #fecaca;
}

.alert-info {
    background: #eff6ff;
    color: #1d4ed8;
    border-color: #bfdbfe;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.45rem;
    font-weight: 700;
    color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.82rem 0.95rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text);
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.03);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.form-group input[type="file"] {
    padding: 0.72rem 0.8rem;
    background: #f7faff;
    border-style: dashed;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: rgba(79, 124, 255, 0.7);
    outline: none;
    box-shadow: 0 0 0 4px rgba(79, 124, 255, 0.14);
}

button,
input[type="submit"],
input[type="button"] {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 0.8rem 1.25rem;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 700;
    letter-spacing: 0.01em;
    box-shadow: 0 12px 26px rgba(79, 124, 255, 0.24);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

button:hover,
input[type="submit"]:hover,
input[type="button"]:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 28px rgba(79, 124, 255, 0.28);
    filter: brightness(1.02);
}

.card {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 248, 255, 0.98));
    border: 1px solid rgba(146, 168, 202, 0.2);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    border-color: rgba(79, 124, 255, 0.2);
}

.card h2,
.card h3 {
    margin-top: 0;
    color: var(--text);
}

ul {
    list-style-type: none;
    padding: 0;
    display: grid;
    gap: 0.7rem;
}

ul li {
    margin-bottom: 0;
    padding: 0.7rem 0.2rem;
    border-bottom: 1px solid rgba(124, 144, 177, 0.18);
}

ul li:last-child {
    border-bottom: none;
}

ul li a {
    color: var(--primary-dark);
    text-decoration: none;
    font-weight: 700;
}

ul li a:hover {
    text-decoration: underline;
}

.hero {
    position: relative;
    overflow: hidden;
    padding: 2.2rem 2rem;
    margin-bottom: 1.25rem;
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.08), rgba(27, 183, 167, 0.06));
    border: 1px solid rgba(79, 124, 255, 0.12);
    border-left: 5px solid var(--primary);
}

.hero::before {
    content: "";
    position: absolute;
    inset: -30% auto auto -10%;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(79, 124, 255, 0.15), transparent 65%);
    pointer-events: none;
}

.hero h1 {
    position: relative;
    z-index: 1;
    margin: 0 0 0.7rem;
    font-size: clamp(1.9rem, 3vw, 2.7rem);
    line-height: 1.15;
}

.hero p {
    position: relative;
    z-index: 1;
    margin: 0;
    color: var(--muted);
    font-size: 1.02rem;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 0.7rem;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--primary-dark);
}

.hero-actions {
    position: relative;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.button-link {
    display: inline-block;
    padding: 0.8rem 1.2rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-decoration: none;
    box-shadow: 0 12px 26px rgba(79, 124, 255, 0.22);
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 15px 30px rgba(79, 124, 255, 0.28);
}

.button-link.secondary {
    background: rgba(255, 255, 255, 0.7);
    color: var(--primary-dark);
    box-shadow: none;
    border: 1px solid rgba(79, 124, 255, 0.18);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.feature-card {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    min-height: 180px;
}

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    margin-bottom: 0.8rem;
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.12), rgba(27, 183, 167, 0.1));
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 1.2rem;
}

.feature-panel {
    padding-top: 1.2rem;
}

.feature-header {
    margin-bottom: 1rem;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.feature-list > div {
    padding: 1rem 1.1rem;
    border-radius: 14px;
    background: rgba(79, 124, 255, 0.03);
    border: 1px solid rgba(79, 124, 255, 0.08);
}

.feature-list h3 {
    margin: 0 0 0.45rem;
}

.feature-list p {
    margin: 0;
    color: var(--muted);
}

.auth-card {
    max-width: 560px;
    margin: 0 auto;
    padding: 1.8rem 1.6rem;
}

.auth-intro {
    margin-bottom: 1.1rem;
}

.auth-card h1 {
    margin-top: 0.15rem;
    margin-bottom: 0.45rem;
}

.auth-card p {
    color: var(--muted);
}

.auth-form {
    display: block;
}

.helper-text {
    margin: 0.2rem 0 1rem;
    font-size: 0.94rem;
    color: var(--muted);
}

.auth-submit {
    width: 100%;
    margin-top: 0.5rem;
}

.auth-link {
    margin-top: 1rem;
    text-align: center;
}

.table-wrapper {
    overflow-x: auto;
    margin-top: 1rem;
}

.file-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.92);
    border-radius: 14px;
    overflow: hidden;
}

.file-table th,
.file-table td {
    padding: 0.9rem 0.8rem;
    text-align: left;
    border-bottom: 1px solid rgba(124, 144, 177, 0.2);
}

.file-table th {
    font-size: 0.8rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: rgba(79, 124, 255, 0.04);
}

.file-table tr:last-child td {
    border-bottom: none;
}

.button-link.small {
    padding: 0.6rem 0.95rem;
    font-size: 0.95rem;
    display: inline-block;
}

.empty-state {
    padding: 1.25rem;
    margin-top: 1rem;
    border: 1px dashed rgba(124, 144, 177, 0.5);
    border-radius: 14px;
    background: rgba(79, 124, 255, 0.03);
    color: var(--muted);
    text-align: center;
}

.footer {
    text-align: center;
    padding: 1.2rem 1rem 1.7rem;
    color: var(--muted);
    font-size: 0.95rem;
    background: rgba(255, 255, 255, 0.45);
    border-top: 1px solid rgba(124, 144, 177, 0.18);
}

.footer-inner {
    max-width: 980px;
    margin: 0 auto;
}

.footer a {
    color: var(--primary-dark);
    text-decoration: none;
    font-weight: 600;
}

.footer a:hover {
    text-decoration: underline;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

@media (max-width: 760px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem 1rem 0.9rem;
    }

    .nav-links {
        justify-content: flex-start;
        width: 100%;
    }

    .container {
        padding-top: 1.5rem;
    }

    .hero {
        padding: 1.5rem 1.2rem;
    }
}


@media (max-width: 768px) {
    nav {
        padding: 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .container {
        padding: 1.25rem 1rem 2rem;
    }
}