:root {
    --gray-900: #0A0A0B;
    --gray-800: #141416;
    --gray-700: #1C1C1F;
    --gray-600: #2A2A2E;
    --gray-400: #8A8A8E;
    --white: #F5F5F7;
    --glass: rgba(28, 28, 31, 0.65);
    --glass-border: rgba(255, 255, 255, 0.08);
    --accent: #E5E5EA;
    --error: #FF3B30;
    --success: #30D158;
    }

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

    body {
        font-family: 'Ubuntu', sans-serif;
        color: var(--white);
        min-height: 100vh;
        background: var(--gray-900);
        overflow-x: hidden;
        position: relative;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 80px 20px 40px 20px;
    }

    body::before {
        content: "";
        position: fixed;
        inset: 0;
        background:
            radial-gradient(circle at 20% 50%, rgba(120, 120, 120, 0.03) 0%, transparent 50%),
            radial-gradient(circle at 80% 80%, rgba(120, 120, 120, 0.03) 0%, transparent 50%),
            linear-gradient(180deg, var(--gray-900) 0%, #000 100%);
        z-index: -2;
    }

.particles {
        position: fixed;
        inset: 0;
        z-index: -1;
        overflow: hidden;
        pointer-events: none;
    }

.particle {
        position: absolute;
        width: 2px;
        height: 2px;
        background: rgba(255, 255, 255, 0.15);
        border-radius: 50%;
        animation: fall linear infinite;
    }

    @keyframes fall {
        to { transform: translateY(100vh); opacity: 0; }
    }

.topbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        padding: 15px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 100;
        background: rgba(10, 10, 11, 0.8);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--glass-border);
    }

.btn-topbar {
        background: var(--glass);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        color: var(--white);
        padding: 10px 18px;
        border-radius: 12px;
        text-decoration: none;
        font-weight: 500;
        font-size: 0.85em;
        transition: 0.3s;
        display: flex;
        align-items: center;
        gap: 8px;
        cursor: pointer;
        z-index: 101;
    }
.btn-topbar:hover {
        background: rgba(255, 255, 255, 0.1);
        border-color: rgba(255, 255, 255, 0.2);
    }

.header-info {
        text-align: center;
        margin-bottom: 20px;
        animation: fadeIn 0.6s ease;
        width: 100%;
        max-width: 38em;
    }

.welcome-msg {
        font-size: 1.8em;
        font-weight: 300;
        color: var(--white);
        margin-bottom: 8px;
        letter-spacing: -0.5px;
    }

.info-cards {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        margin-bottom: 25px;
        width: 100%;
        max-width: 38em;
    }

.info-card {
        background: var(--glass);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: 14px;
        padding: 18px;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    }
.info-card:hover {
        background: rgba(255, 255, 255, 0.08);
        border-color: rgba(255, 255, 255, 0.15);
        transform: translateY(-3px);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    }

.info-card i {
        font-size: 1.9em;
        color: var(--gray-400);
        margin-bottom: 8px;
        display: block;
    }

.info-card-label {
        font-size: 0.7em;
        color: var(--gray-400);
        text-transform: uppercase;
        letter-spacing: 1px;
        margin-bottom: 5px;
        font-weight: 600;
    }

.info-card-value {
        font-size: 0.95em;
        font-weight: 600;
        color: var(--white);
        word-break: break-all;
        min-height: 20px;
    }

.info-card-btn {
        width: 100%;
        background: var(--white);
        color: #000;
        border: none;
        padding: 11px;
        border-radius: 10px;
        font-weight: 700;
        font-size: 0.75em;
        text-transform: uppercase;
        letter-spacing: 1px;
        cursor: pointer;
        transition: 0.3s;
        margin-top: 8px;
    }
.info-card-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 15px rgba(255, 255, 255, 0.15);
    }

.modal {
        background: var(--glass);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border-radius: 24px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        width: calc(100% - 2em);
        max-width: 38em;
        border: 1px solid var(--glass-border);
        overflow: hidden;
    }

.modal__header {
        padding: 1.2em;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-bottom: 1px solid var(--glass-border);
    }

      .modal__content { display: none; padding: 2.5em; animation: fadeIn 0.4s ease; }
      .modal[data-state="0"] .modal__content:nth-child(2),
      .modal[data-state="1"] .modal__content:nth-child(3),
      .modal[data-state="2"] .modal__content:nth-child(4),
      .modal[data-state="3"] .modal__content:nth-child(5) { display: block; }
      
.modal__title {
        font-size: 1.6em;
        font-weight: 700;
        color: var(--white);
        letter-spacing: -0.5px;
        margin-bottom: 1.2rem;
        text-align: center;
    }

.modal__description-list {
        margin-bottom: 1.8em;
        font-size: 0.85em;
        color: var(--gray-400);
        list-style: none;
        background: rgba(0, 0, 0, 0.2);
        padding: 16px;
        border-radius: 12px;
        border: 1px solid var(--glass-border);
    }
.modal__description-list li {
        margin-bottom: 8px;
        display: flex;
        align-items: center;
        gap: 10px;
    }
.modal__description-list li:last-child { margin-bottom: 0; }

.drop-zone {
        border: 2px dashed var(--glass-border);
        padding: 3em;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        cursor: pointer;
        transition: 0.3s;
        background: rgba(0, 0, 0, 0.2);
    }
.drop-zone:hover {
        border-color: rgba(255, 255, 255, 0.2);
        background: rgba(255, 255, 255, 0.03);
        transform: scale(1.01);
    }
.drop-zone.has-file {
        border-color: var(--gray-400);
        background: rgba(255, 255, 255, 0.05);
 }
.drop-zone.has-file i {
        color: var(--white);
 }

.btn-main {
        width: 100%;
        background: var(--white);
        color: #000;
        padding: 1.1em;
        border: none;
        border-radius: 12px;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 1px;
        cursor: pointer;
        margin-top: 18px;
        transition: 0.3s;
        font-size: 0.85em;
    }
.btn-main:hover:not(:disabled) {
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(255, 255, 255, 0.15);
    }
.btn-main:disabled {
        background: var(--gray-700);
        color: var(--gray-400);
        cursor: not-allowed;
        transform: none;
        box-shadow: none;
    }

.side-menu-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(5px);
        -webkit-backdrop-filter: blur(5px);
        z-index: 998;
        opacity: 0;
        pointer-events: none;
        transition: 0.3s;
    }
.side-menu-overlay.active {
        opacity: 1;
        pointer-events: all;
    }

.side-menu {
        position: fixed;
        top: 0;
        right: -320px;
        width: 300px;
        height: 100vh;
        background: var(--glass);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border-left: 1px solid var(--glass-border);
        z-index: 999;
        transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        padding: 25px;
        overflow-y: auto;
    }
.side-menu.active {
        right: 0;
    }

.side-menu-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 30px;
        padding-bottom: 20px;
        border-bottom: 1px solid var(--glass-border);
    }

.side-menu-title {
        font-size: 1.2em;
        font-weight: 700;
        color: var(--white);
    }

.side-menu-close {
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid var(--glass-border);
        color: var(--white);
        width: 35px;
        height: 35px;
        border-radius: 10px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: 0.3s;
    }
.side-menu-close:hover {
        background: rgba(255, 255, 255, 0.1);
    }

.side-menu-links {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

.side-menu-links a {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 14px 16px;
        border-radius: 12px;
        text-decoration: none;
        color: var(--gray-400);
        background: rgba(0, 0, 0, 0.2);
        border: 1px solid var(--glass-border);
        transition: 0.3s;
        font-size: 0.9em;
        font-weight: 500;
    }
.side-menu-links a:hover {
        background: rgba(255, 255, 255, 0.05);
        color: var(--white);
        border-color: rgba(255, 255, 255, 0.15);
        transform: translateX(5px);
    }
.side-menu-links a i {
        font-size: 1.3em;
    }

    #splashScreen {
        position: fixed;
        inset: 0;
        background: var(--gray-900);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 9999;
        flex-direction: column;
        animation: fadeOut 0.8s forwards 2.5s;
    }

.progress-bg {
        background: rgba(255,255,255,0.08);
        height: 8px;
        border-radius: 4px;
        overflow: hidden;
        margin: 20px 0;
        position: relative;
    }
.progress-fill {
        background: linear-gradient(90deg, var(--gray-600), var(--white));
        height: 100%;
        width: 0%;
        transition: 0.3s;
        position: relative;
        overflow: hidden;
    }
.progress-fill::after {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
        animation: shimmer 1.5s infinite;
    }

.error-title { color: var(--error)!important; }
.success-copy { background: var(--success)!important; color: #000!important; }

    @keyframes shimmer {
        0% { transform: translateX(-100%); }
        100% { transform: translateX(100%); }
    }

    @keyframes fadeOut { to { opacity: 0; visibility: hidden; } }
    @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } }