/* ==================== Global Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #64748b;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}



/* ==================== Hero Section ==================== */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px 0 80px 0;
}


/* ==================== Calculator Card ==================== */
.calculator-card {
    background: white;
    border-radius: 20px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
}

.card-header {
    text-align: center;
    margin-bottom: 24px;
}

.logo-text {
    font-size: 28px;
    color: var(--dark);
    margin: 0;
}

/* ==================== Form Styles ==================== */
.calculator-form {
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    font-size: 14px;
}

.label-icon {
    font-size: 16px;
}

.input-group {
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.input-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 14px;
    font-family: 'Poppins', sans-serif;
    transition: all 0.3s;
    background: #f8fafc;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
}

.char-counter {
    text-align: center;
    font-size: 12px;
    color: var(--gray);
    margin-top: 4px;
}

.btn-primary {
    padding: 12px 20px;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 24px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    min-width: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, opacity 0.3s;
}

.btn-primary:hover {
    transform: scale(1.05);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary.loading {
    pointer-events: none;
    opacity: 0.8;
}

.btn-primary.loading .btn-text {
    opacity: 0;
}

.btn-loader {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-primary.loading .btn-loader {
    display: block;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ==================== Results Section ==================== */
.results-section.hidden {
    display: none;
}

.results-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.result-card {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    flex: 1;
    min-width: 140px;
}

.result-icon {
    font-size: 24px;
    margin-bottom: 6px;
}

.result-label {
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 4px;
    opacity: 0.8;
}

.result-value {
    font-size: 20px;
    font-weight: 700;
}

/* ==================== Error Message ==================== */
.error-message {
    background: #fee2e2;
    border: 2px solid var(--error);
    color: #991b1b;
    padding: 12px 16px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
}

.error-message.hidden {
    display: none;
}

.error-icon {
    font-size: 20px;
}




/* ==================== Footer ==================== */
.footer {
    background: #1e293b;
    color: white;
    padding: 20px 0;
    text-align: center;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.footer .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer p {
    margin: 0;
    font-size: 13px;
}


/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 16px 0 80px 0;
    }

    .calculator-card {
        padding: 24px 20px;
        border-radius: 16px;
    }

    .logo-text {
        font-size: 24px;
    }

    .input-group {
        gap: 6px;
    }

    .form-input {
        font-size: 16px;
        padding: 14px 16px;
    }

    .btn-primary {
        padding: 14px 18px;
        font-size: 22px;
        min-width: 54px;
    }

    .results-grid {
        gap: 10px;
    }

    .result-card {
        min-width: 100%;
        padding: 18px;
    }

    .result-icon {
        font-size: 28px;
    }

    .result-label {
        font-size: 13px;
    }

    .result-value {
        font-size: 24px;
    }

    .footer p {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .calculator-card {
        padding: 20px 16px;
        border-radius: 12px;
    }

    .logo-text {
        font-size: 22px;
    }

    .form-label {
        font-size: 13px;
    }

    .input-group {
        gap: 6px;
    }

    .form-input {
        font-size: 16px;
        padding: 12px 14px;
    }

    .char-counter {
        font-size: 11px;
    }

    .btn-primary {
        padding: 12px 16px;
        font-size: 20px;
        min-width: 50px;
    }

    .result-card {
        padding: 16px;
    }

    .result-icon {
        font-size: 26px;
    }

    .result-label {
        font-size: 12px;
    }

    .result-value {
        font-size: 22px;
    }

    .error-message {
        font-size: 13px;
        padding: 10px 14px;
    }

    .footer {
        padding: 16px 0;
    }

    .footer p {
        font-size: 11px;
    }
}