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

:root {
    --dark-bg: #15101c;
    --dark-secondary: #21172c;
    --dark-tertiary: #30203d;
    --panel: rgba(34, 24, 45, 0.78);
    --panel-strong: rgba(43, 29, 57, 0.94);
    --white: #f6efff;
    --white-secondary: #e9dcff;
    --gray: #a897bb;
    --gray-soft: #d0c0e2;
    --border: rgba(196, 181, 253, 0.14);
    --border-strong: rgba(216, 180, 254, 0.34);
    --shadow: rgba(11, 6, 18, 0.46);
    --glow: rgba(192, 132, 252, 0.28);
    --accent: #b779ff;
    --accent-secondary: #d8b4fe;
    --success: #c084fc;
    --error: #fb7185;
    --warning: #f9a8d4;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.22, 1.2, 0.36, 1);
}

html {
    background: var(--dark-bg);
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    background:
        radial-gradient(circle at 14% 12%, rgba(124, 58, 237, 0.26), transparent 25rem),
        radial-gradient(circle at 88% 4%, rgba(217, 70, 239, 0.18), transparent 23rem),
        linear-gradient(135deg, #120d18 0%, #21152d 48%, #171020 100%);
    color: var(--white);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-weight: 300;
    line-height: 1.6;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        linear-gradient(rgba(216, 180, 254, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(216, 180, 254, 0.045) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(circle at center, black 0%, transparent 74%);
    opacity: 0.42;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: linear-gradient(120deg, transparent 0%, rgba(216, 180, 254, 0.08) 48%, transparent 62%);
    opacity: 0.28;
    transform: translateX(-70%);
    animation: ambientSweep 12s var(--ease-out) infinite;
}

body > :not(.particle-field) {
    position: relative;
    z-index: 1;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--white);
    font-weight: 300;
    letter-spacing: 0;
}

strong,
b {
    font-weight: 500;
}

a {
    color: inherit;
}

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

button,
a,
input,
.upload-area,
.stat-card,
.file-item,
.log-item,
.modal-close {
    -webkit-tap-highlight-color: transparent;
}

button,
.btn-auth,
.btn-upload,
.btn-submit,
.btn-action,
.btn-small,
.btn-create-invite,
.btn-logout,
.btn-back,
.nav-item {
    position: relative;
    overflow: hidden;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 1px solid var(--white);
    outline-offset: 3px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.particle-field {
    position: fixed;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.9;
}

.particle-field.is-muted {
    opacity: 0.42;
}

.motion-in {
    animation: riseIn 0.78s var(--ease-out) both;
    animation-delay: var(--delay, 0ms);
}

.button-ripple {
    position: absolute;
    width: 12px;
    height: 12px;
    pointer-events: none;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.36);
    transform: translate(-50%, -50%) scale(0);
    animation: ripple 0.75s ease-out forwards;
}

.btn-auth,
.btn-upload,
.btn-submit,
.btn-action,
.btn-small,
.btn-create-invite,
.btn-logout,
.btn-back {
    border: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(216, 180, 254, 0.035));
    color: var(--white);
    cursor: pointer;
    text-decoration: none;
    letter-spacing: 0;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 12px 32px var(--shadow);
    transition: transform 0.28s var(--ease-spring), border-color 0.28s ease, background 0.28s ease, color 0.28s ease, box-shadow 0.28s ease;
}

.btn-auth:hover,
.btn-upload:hover,
.btn-submit:hover,
.btn-action:hover,
.btn-small:hover,
.btn-create-invite:hover,
.btn-back:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    background: var(--accent);
    color: #160f20;
    box-shadow: 0 16px 42px rgba(183, 121, 255, 0.2);
}

.btn-auth:active,
.btn-upload:active,
.btn-submit:active,
.btn-action:active,
.btn-small:active,
.btn-create-invite:active,
.btn-logout:active,
.btn-back:active {
    transform: translateY(0) scale(0.985);
}

.btn-upload:disabled,
.btn-submit:disabled {
    cursor: not-allowed;
    opacity: 0.55;
    transform: none;
}

header {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 2rem 0;
    margin-bottom: 3rem;
}

.btn-auth {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
}

main {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.upload-section {
    max-width: 440px;
    margin: 0 auto;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: 0 22px 70px var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.07);
    backdrop-filter: blur(18px);
}

.upload-area {
    position: relative;
    display: grid;
    min-height: 220px;
    place-items: center;
    gap: 0.45rem;
    margin: 0 0 1rem;
    padding: 1.5rem;
    overflow: hidden;
    cursor: pointer;
    border: 1px dashed var(--border-strong);
    border-radius: 8px;
    background:
        linear-gradient(135deg, rgba(183, 121, 255, 0.16), transparent 45%),
        rgba(255, 255, 255, 0.03);
    text-align: center;
    transition: transform 0.32s var(--ease-spring), border-color 0.32s ease, background 0.32s ease, box-shadow 0.32s ease;
}

.upload-area::before {
    content: "";
    position: absolute;
    inset: 8px;
    border: 1px solid rgba(216, 180, 254, 0.08);
    border-radius: 6px;
    pointer-events: none;
}

.upload-area svg,
.upload-icon svg {
    color: var(--white);
    opacity: 0.78;
    filter: drop-shadow(0 0 18px rgba(216, 180, 254, 0.18));
    transition: transform 0.32s var(--ease-spring), opacity 0.32s ease;
}

.upload-area:hover,
.upload-area.dragover {
    transform: translateY(-3px);
    border-color: var(--accent);
    background:
        linear-gradient(135deg, rgba(183, 121, 255, 0.24), transparent 45%),
        rgba(255, 255, 255, 0.055);
    box-shadow: 0 18px 52px rgba(183, 121, 255, 0.14);
}

.upload-area:hover svg,
.upload-area.dragover svg {
    opacity: 1;
    transform: translateY(-4px) scale(1.04);
}

.upload-area h3 {
    max-width: 100%;
    font-size: clamp(1.05rem, 2vw, 1.35rem);
    word-break: break-word;
}

.upload-area p {
    color: var(--gray);
    font-size: 0.9rem;
}

.btn-upload {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 46px;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.98rem;
}

.message {
    display: none;
    margin-top: 1rem;
    padding: 0.9rem 1rem;
    border-radius: 8px;
    animation: riseIn 0.45s var(--ease-out);
}

.message.success {
    display: block;
    border: 1px solid var(--white);
    background: rgba(183, 121, 255, 0.12);
    color: var(--white);
}

.message.error {
    display: block;
    border: 1px solid var(--error);
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

@keyframes ambientSweep {
    0% {
        transform: translateX(-72%);
    }

    46%,
    100% {
        transform: translateX(82%);
    }
}

@keyframes riseIn {
    from {
        opacity: 0;
        transform: translateY(18px) scale(0.985);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes ripple {
    to {
        opacity: 0;
        transform: translate(-50%, -50%) scale(30);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    body::before {
        background-size: 52px 52px;
    }
}