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

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f3f4f6;
    color: #111827;
}

/* App shell */
.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Top bar */
.topbar {
    height: 64px;
    background: #0f172a;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.5);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 999px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.6);
    flex-shrink: 0;
    background: #111827;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.identity-name {
    font-weight: 600;
    font-size: 15px;
}

.identity-meta {
    font-size: 13px;
    opacity: 0.85;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: transparent;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.15s ease-out, transform 0.1s ease-out;
}

.icon-btn i {
    font-size: 14px;
}

.icon-btn:hover {
    background: rgba(15, 23, 42, 0.4);
    transform: translateY(-1px);
}

.icon-btn.logout-btn {
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(248, 113, 113, 0.7);
}

.icon-btn.logout-btn:hover {
    background: rgba(239, 68, 68, 0.22);
}

/* Main area */
.main {
    flex: 1;
    padding: 24px 18px 32px;
}

/* Grid of tiles */
/* Desktop: 4 columns, Tablet: 3, Mobile: 2 */
.grid {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

.tile {
    text-decoration: none;
    background: #ffffff;
    border-radius: 20px;
    padding: 26px 20px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow:
        0 18px 45px rgba(15, 23, 42, 0.10),
        0 0 0 1px rgba(15, 23, 42, 0.02);
    color: #111827;
    transition:
        transform 0.14s ease-out,
        box-shadow 0.14s ease-out,
        background 0.14s ease-out;
}

.tile:hover {
    transform: translateY(-4px);
    box-shadow:
        0 26px 60px rgba(15, 23, 42, 0.18),
        0 0 0 1px rgba(15, 23, 42, 0.04);
    background: #f9fafb;
}

.tile-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;        /* transparent bg */
    color: #1f2933;                 /* dark grey */
}

.tile-icon i {
    font-size: 26px;
    font-weight: 400;
}

.tile-label {
    text-align: center;
    font-size: 14px;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 960px) {
    .grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
    }
}

@media (max-width: 720px) {
    .topbar {
        padding-inline: 12px;
    }

    .identity-name {
        font-size: 14px;
    }

    .identity-meta {
        font-size: 12px;
    }

    .grid {
        grid-template-columns: repeat(2, minmax(0, 1fr)); /* mobile: 2 columns */
        gap: 14px;
    }

    .tile {
        padding: 20px 14px 16px;
    }

    .tile-icon {
        width: 46px;
        height: 46px;
    }

    .tile-icon i {
        font-size: 20px;
    }

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

/* Profile layout (same as before) */
.profile-layout {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 24px;
}

/* Left card unchanged ... */

/* Right: tabbed details */
.profile-details {
    background: #ffffff;
    border-radius: 20px;
    padding: 20px 18px 18px;
    box-shadow:
        0 18px 45px rgba(15, 23, 42, 0.10),
        0 0 0 1px rgba(15, 23, 42, 0.02);
}

.profile-tabs-wrapper input[type="radio"] {
    display: none;
}

/* Tabs row */
.profile-tabs {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-radius: 999px;
    padding: 3px;
    background: #f3f4f6;
    margin-bottom: 16px;
    column-gap: 2px;
}

.profile-tabs label {
    position: relative;
    z-index: 1;
    cursor: pointer;
    text-align: center;
    padding: 7px 0;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #6b7280;
    user-select: none;
}

.profile-tabs-indicator {
    position: absolute;
    top: 3px;
    bottom: 3px;
    width: calc(33.333% - 4px);
    border-radius: 999px;
    background: #111827;
    transform: translateX(0%);
    transition: transform 0.2s ease-out;
}

/* Panels */
.profile-panels {
    margin-top: 4px;
}

.profile-panel {
    display: none;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 24px;
}

/* Show correct panel based on checked radio */
#tab-main:checked ~ .profile-tabs .profile-tabs-indicator {
    transform: translateX(0%);
}
#tab-classes:checked ~ .profile-tabs .profile-tabs-indicator {
    transform: translateX(100%);
}
#tab-subjects:checked ~ .profile-tabs .profile-tabs-indicator {
    transform: translateX(200%);
}

/* active label color */
#tab-main:checked ~ .profile-tabs label:nth-of-type(1),
#tab-classes:checked ~ .profile-tabs label:nth-of-type(2),
#tab-subjects:checked ~ .profile-tabs label:nth-of-type(3) {
    color: #ffffff;
    font-weight: 600;
}

/* which panel is visible */
.profile-panel {display: none;grid-template-columns: repeat(2, minmax(0, 1fr));gap: 14px 24px;}

#tab-main:checked ~ .profile-panels .profile-panel[data-panel="main"],
#tab-classes:checked ~ .profile-panels .profile-panel[data-panel="classes"],
#tab-subjects:checked ~ .profile-panels .profile-panel[data-panel="subjects"] {
    display: grid;
}

/* Detail styling */
.detail-group {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.detail-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #9ca3af;
}

.detail-value {
    font-size: 14px;
    color: #111827;
    word-break: break-word;
}

.detail-address {
    grid-column: 1 / -1;
}

/* Responsive */
@media (max-width: 768px) {
    .profile-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .profile-panel {
        grid-template-columns: minmax(0, 1fr);
    }
}

/* Profile layout shell */
.profile-layout {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 24px;
}

/* Left profile card */
.profile-card {
    background: #ffffff;
    border-radius: 20px;
    padding: 24px 20px 20px;
    box-shadow:
        0 18px 45px rgba(15, 23, 42, 0.10),
        0 0 0 1px rgba(15, 23, 42, 0.02);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

/* Photo */
.profile-photo {
    width: 96px;
    height: 96px;
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 8px;
    background: #e5e7eb;
}

.profile-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Text under photo */
.profile-name {
    font-size: 18px;
    font-weight: 600;
    color: #111827;
    text-align: center;
}

.profile-class,
.profile-addm {
    font-size: 13px;
    color: #6b7280;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .profile-layout {
        grid-template-columns: minmax(0, 1fr);
    }
}


/* Style all text inputs and selects */
.detail-value[type="text"],
.detail-value[type="file"],
.detail-value,
select.detail-value {
    padding: 8px 12px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: #f9fafb;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    width: 100%;
    box-sizing: border-box;
}

/* Focus state */
.detail-value:focus,
select.detail-value:focus {
    border-color: #111827;
    box-shadow: 0 0 0 2px rgba(17, 24, 39, 0.1);
    background: #ffffff;
}

/* File input custom style (optional for consistency) */
input[type="file"].detail-value {
    padding: 6px 10px;
    border-radius: 8px;
    background: #f3f4f6;
    cursor: pointer;
}