/* ===== Base Styles ===== */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Card Appear Animation ===== */
.card-appear {
    animation: cardAppear 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(16px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===== Page Transitions ===== */
.page-content {
    animation: pageIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pageIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Navigation Buttons ===== */
.nav-btn {
    color: #64748b;
    background: transparent;
}

.nav-btn.active {
    color: #2563eb;
    background: #eff6ff;
}

.nav-btn:hover:not(.active) {
    color: #475569;
    background: #f8fafc;
}

/* ===== Input Focus Ring ===== */
.input-field:focus {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===== Select Arrow Fix ===== */
select.input-field {
    background-image: none;
}

/* ===== Loading Spinner ===== */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Table Row Hover ===== */
#marksBody tr {
    transition: background-color 0.15s ease;
}

#marksBody tr:hover {
    background-color: #f8fafc;
}

/* ===== Mark Row Slide In ===== */
.mark-row {
    animation: markSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

@keyframes markSlideIn {
    from {
        opacity: 0;
        transform: translateX(-8px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== Status Badge Pulse ===== */
.status-badge {
    animation: badgePop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes badgePop {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===== Download Button Shine ===== */
#downloadBtn {
    position: relative;
    overflow: hidden;
}

#downloadBtn::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        to right,
        transparent 0%,
        rgba(255,255,255,0.15) 50%,
        transparent 100%
    );
    transform: rotate(30deg) translateX(-100%);
    transition: transform 0.6s ease;
}

#downloadBtn:hover::after {
    transform: rotate(30deg) translateX(100%);
}

/* ===== Shake Animation (for errors) ===== */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* ===== Grade Badges ===== */
.grade-a-plus { background: #dcfce7; color: #166534; }
.grade-a { background: #dcfce7; color: #166534; }
.grade-b-plus { background: #dbeafe; color: #1e40af; }
.grade-b { background: #dbeafe; color: #1e40af; }
.grade-c { background: #fef9c3; color: #854d0e; }
.grade-d { background: #ffedd5; color: #9a3412; }
.grade-f { background: #fee2e2; color: #991b1b; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ===== Print Styles ===== */
@media print {
    header, footer, nav, #searchCard, #resetBtn, #downloadBtn {
        display: none !important;
    }

    #resultArea {
        display: block !important;
    }

    body {
        background: white !important;
    }
}

/* ===== Mobile Responsive Tweaks ===== */
@media (max-width: 400px) {
    #marksBody th,
    #marksBody td {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
        font-size: 0.7rem;
    }
}

/* ===== Focus Visible ===== */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}