:root {
    --steam-blue: #1b2838;
    --steam-dark-blue: #171a21;
    --steam-darkest: #0e1419;
    --steam-light-blue: #2a475e;
    --steam-highlight: #66c0f4;
    --steam-accent: #5ba3d0;
    --steam-text: #c7d5e0;
    --steam-text-dark: #8f98a0;
    --steam-border: #3d4450;
    --steam-hover: #417a9b;
    --glow-blue: rgba(102, 192, 244, 0.3);
    --glow-blue-strong: rgba(102, 192, 244, 0.6);
}

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

body {
    background:
        linear-gradient(135deg, rgba(10, 14, 39, 0.98) 0%, rgba(26, 31, 58, 0.98) 25%, rgba(27, 40, 56, 0.98) 50%, rgba(15, 20, 25, 0.98) 100%);
    background-color: var(--steam-darkest);
    color: var(--steam-text);
    font-family: "Segoe UI", "Motiva Sans", Arial, Helvetica, sans-serif;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 20% 30%, rgba(102, 192, 244, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(91, 163, 208, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.page-wrapper {
    position: relative;
    z-index: 1;
    padding: 2.5rem 1rem;
}

.main-container {
    max-width: 600px;
    margin: 0 auto;
}

.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    color: var(--steam-text);
    font-weight: 700;
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px var(--glow-blue);
}

.page-header h1 i {
    color: var(--steam-highlight);
}

.page-header p {
    color: var(--steam-text-dark);
    font-size: 1rem;
}

.main-card {
    background: rgba(42, 71, 94, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid var(--steam-border);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(102, 192, 244, 0.05);
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--steam-text);
    margin-bottom: 0.65rem;
    font-size: 0.9rem;
    letter-spacing: 0.3px;
}

.url-input {
    width: 100%;
    background: rgba(23, 26, 33, 0.8);
    border: 1px solid var(--steam-border);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    color: var(--steam-text);
    font-family: inherit;
    transition: all 0.2s ease;
    outline: none;
    margin-bottom: 0.85rem;
}

.url-input::placeholder {
    color: var(--steam-text-dark);
}

.url-input:focus {
    border-color: var(--steam-highlight);
    box-shadow: 0 0 0 3px var(--glow-blue);
}

.btn-modern {
    border-radius: 4px;
    padding: 0.55rem 1.1rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.88rem;
    letter-spacing: 0.3px;
}

.btn-modern:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-shorten {
    background: linear-gradient(135deg, var(--steam-accent) 0%, var(--steam-highlight) 100%);
    color: #0e1419;
    font-weight: 700;
    padding: 0.65rem 1.75rem;
    font-size: 0.95rem;
}

.btn-shorten:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px var(--glow-blue);
}

.btn-primary-modern {
    background: var(--steam-light-blue);
    color: var(--steam-text);
    border: 1px solid var(--steam-border);
}

.btn-primary-modern:hover:not(:disabled) {
    background: var(--steam-hover);
    color: white;
    transform: translateY(-1px);
}

.btn-secondary-modern {
    background: rgba(61, 68, 80, 0.6);
    color: var(--steam-text-dark);
    border: 1px solid var(--steam-border);
}

.btn-secondary-modern:hover:not(:disabled) {
    background: rgba(61, 68, 80, 0.9);
    color: var(--steam-text);
    transform: translateY(-1px);
}

.btn-info-modern {
    background: transparent;
    color: var(--steam-accent);
    border: 1px solid var(--steam-accent);
}

.btn-info-modern:hover:not(:disabled) {
    background: var(--steam-accent);
    color: var(--steam-darkest);
    transform: translateY(-1px);
}

.spinner-border {
    display: inline-block;
    width: 0.85rem;
    height: 0.85rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.65s linear infinite;
    vertical-align: -0.1em;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.result-container {
    background: rgba(23, 26, 33, 0.5);
    border: 1px dashed var(--steam-border);
    border-radius: 6px;
    padding: 1rem 1.25rem;
    margin-top: 1.25rem;
    min-height: 54px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-placeholder {
    color: var(--steam-text-dark);
    font-style: italic;
    font-size: 0.9rem;
}

.result-container a {
    color: var(--steam-highlight);
    font-weight: 600;
    text-decoration: none;
    word-break: break-all;
    font-size: 1rem;
    text-shadow: 0 0 8px var(--glow-blue);
}

.result-container a:hover {
    color: white;
}

.divider {
    height: 1px;
    background: var(--steam-border);
    margin: 1.75rem 0;
}

.section-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
}

.button-group {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.button-group-center {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    justify-content: center;
}

@media (max-width: 576px) {
    .main-card { padding: 1.25rem; }
    .page-header h1 { font-size: 1.75rem; }
    .section-actions { flex-direction: column; width: 100%; }
    .button-group { width: 100%; justify-content: center; }
    .btn-shorten { width: 100%; justify-content: center; }
}