/*  GLOBAL VARIABLES */

:root {
    --color-bg: rgb(30, 64, 175);
    --color-surface: #ffffff;
    --color-primary: rgb(59, 130, 246);
    --color-primary-hover: rgb(37, 99, 235);
    --color-border: rgb(203, 213, 225);
    --color-text: rgb(15, 23, 42);
    --color-text-muted: rgb(100, 116, 139);
    --color-success: rgb(34, 197, 94);
    --color-warning: rgb(234, 179, 8);
    --color-error: rgb(239, 68, 68);
    --radius-lg: 18px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --shadow-soft: 0 25px 60px rgba(0, 0, 0, .18);
    --transition: 0.25s ease;
}


/* RESET + BASE STYLES */

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

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: "Segoe UI", system-ui, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
}


/* LAYOUT */

.container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px;
}


/* CARD COMPONENT */

.card {
    width: 100%;
    max-width: 420px;
    padding: 36px;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-soft);
    text-align: center;
    animation: fadeIn .4s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card h1 {
    font-size: 26px;
    margin-bottom: 10px;
}

.muted {
    font-size: 14px;
    margin-bottom: 28px;
    color: var(--color-text-muted);
}


/* form */

.form-group {
    margin-bottom: 22px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
}


/*  FILE UPLOAD */

.upload-box {
    display: block;
    text-align: center;
    padding: 40px 20px;
    border-radius: var(--radius-md);
    cursor: pointer;
    background: #f8fafc;
    border: 2px dashed var(--color-border);
    transition: var(--transition);
}

.upload-box:hover {
    background: #eff6ff;
    border-color: var(--color-primary);
}

.upload-box input {
    display: none;
}

.upload-box span {
    font-size: 14px;
    color: var(--color-text-muted);
}


/* SELECT INPUT */

select {
    width: 100%;
    padding: 13px;
    font-size: 15px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    outline: none;
    background: #fff;
    transition: var(--transition);
}

select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, .15);
}


/*    BUTTON */

.btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    cursor: pointer;
    background: var(--color-primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, .3);
    transition: var(--transition);
}

.btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.btn:active {
    transform: scale(.97);
    box-shadow: none;
}


/* =====================================================
   RESULT BOX
===================================================== */

.result {
    margin-top: 18px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    text-align: center;
    border: 1px dashed var(--color-border);
    background: #f9fafb;
    color: var(--color-text-muted);
}


/* STATUS TEXT COLORS */

.success {
    color: var(--color-success);
    font-weight: 600;
}

.error {
    color: var(--color-error);
    font-weight: 600;
}

.warning {
    color: var(--color-warning);
    font-weight: 600;
}


/* responsive */

@media (max-width: 480px) {
    .card {
        padding: 26px;
    }
    .card h1 {
        font-size: 22px;
    }
    .upload-box {
        padding: 30px 16px;
    }
}