/* Vintage HP Calculator Styles */

/* Import classic fonts */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;700&display=swap');

/* General Page Styles */
body {
    background: linear-gradient(180deg, #1a1612 0%, #0d0a08 100%);
    margin: 0;
    padding: 30px 20px;
    min-height: 100vh;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

/* HP-67 Calculator Body - Classic wedge design */
#calculator-body {
    width: 100%;
    max-width: 420px;
    background: linear-gradient(175deg,
        #3d3832 0%,
        #2a2520 15%,
        #1f1b18 50%,
        #1a1714 100%);
    border-radius: 16px 16px 20px 20px;
    padding: 0;
    box-shadow:
        0 25px 60px rgba(0, 0, 0, 0.8),
        0 10px 30px rgba(0, 0, 0, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.08),
        inset 0 -2px 0 rgba(0, 0, 0, 0.3);
    border: 1px solid #0a0908;
    position: relative;
    overflow: hidden;
}

/* Subtle texture overlay */
#calculator-body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.03) 2px,
            rgba(0, 0, 0, 0.03) 4px
        );
    pointer-events: none;
    border-radius: inherit;
}

/* HP Logo Header Area */
#hp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px 14px 24px;
    background: linear-gradient(180deg,
        rgba(60, 55, 48, 0.6) 0%,
        rgba(40, 36, 32, 0.4) 100%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.3);
}

.hp-logo {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hp-letters {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 700;
    font-size: 28px;
    color: #b8a080;
    text-transform: lowercase;
    letter-spacing: -2px;
    background: linear-gradient(180deg, #d4c4a8 0%, #a08860 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.5));
}

.model-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.model-name {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 700;
    font-size: 24px;
    color: #c4a060;
    letter-spacing: 1px;
}

.model-type {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 400;
    font-size: 9px;
    color: #8a7a60;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-top: 2px;
}

/* Display Bezel - Metallic frame around display */
#display-bezel {
    margin: 16px 18px;
    padding: 4px;
    background: linear-gradient(180deg,
        #5a5048 0%,
        #3a3430 20%,
        #2a2420 80%,
        #4a4238 100%);
    border-radius: 6px;
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.4),
        0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Stack Display Area - Vintage LED style */
#stackDisplay {
    font-family: 'Orbitron', 'Doto', monospace;
    font-weight: 500;
    background: linear-gradient(180deg, #0a0600 0%, #0d0800 50%, #080400 100%);
    border: 2px solid #0a0a08;
    border-radius: 4px;
    padding: 14px 16px 10px 16px;
    color: #ff6600;
    box-shadow:
        inset 0 4px 15px rgba(0, 0, 0, 0.9),
        inset 0 0 40px rgba(0, 0, 0, 0.6),
        inset 0 0 3px rgba(255, 102, 0, 0.1);
    position: relative;
    overflow: hidden;
}

/* LED Scanline effect */
#stackDisplay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.15) 2px,
        rgba(0, 0, 0, 0.15) 4px
    );
    pointer-events: none;
}

/* LED glow effect */
#stackDisplay::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(
        ellipse at center,
        rgba(255, 80, 0, 0.03) 0%,
        transparent 70%
    );
    pointer-events: none;
}

.stack-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 15px;
    height: 22px;
    position: relative;
    z-index: 1;
}

.stack-label {
    min-width: 50px;
    text-align: left;
    color: #cc5500;
    font-weight: 400;
    font-size: 12px;
    opacity: 0.8;
}

.stack-value {
    flex: 1;
    text-align: right;
    padding-right: 8px;
    font-weight: 500;
    font-size: 16px;
    color: #ff7722;
    text-shadow:
        0 0 8px rgba(255, 102, 0, 0.6),
        0 0 15px rgba(255, 60, 0, 0.3);
    letter-spacing: 1px;
    line-height: 22px;
    min-height: 22px;
}

/* Entry row - slightly dimmer */
.entry-label {
    font-weight: 400;
    color: #884400;
    opacity: 0.7;
}

#entry-row .stack-value {
    color: #ff8844;
}

/* Keyboard Section */
#keyboard-section {
    padding: 0 18px 20px 18px;
}

/* HP-67 calculator keyboard layout */
#calcContainer {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 0;
    padding: 0;
}

.button-row {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 5px;
    margin: 0;
}

/* Add visual separator before number pad */
.button-row:nth-child(6) {
    margin-top: 8px;
    padding-top: 10px;
    border-top: 1px solid rgba(80, 70, 55, 0.4);
}

/* Base button styles - Classic HP flat-top beveled keys */
button {
    font-family: 'Roboto Condensed', 'Helvetica Neue', sans-serif;
    font-weight: 600;
    font-size: 12px;
    background: #383330;
    color: #e8e0d0;
    border: none;
    border-radius: 3px;
    width: 100%;
    height: 42px;
    cursor: pointer;
    margin: 0;
    box-shadow:
        /* 3D depth - bottom edge */
        0 4px 0 #1a1815,
        0 5px 3px rgba(0, 0, 0, 0.4),
        /* Top chamfer highlight */
        inset 0 2px 0 rgba(255, 255, 255, 0.12),
        /* Left chamfer highlight */
        inset 2px 0 0 rgba(255, 255, 255, 0.06),
        /* Right chamfer shadow */
        inset -2px 0 0 rgba(0, 0, 0, 0.15),
        /* Bottom chamfer shadow */
        inset 0 -2px 0 rgba(0, 0, 0, 0.25);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
    transition: all 0.08s ease-out;
    padding: 0 3px;
    letter-spacing: 0.5px;
    position: relative;
}

button:hover {
    background: #454038;
    box-shadow:
        0 4px 0 #1a1815,
        0 6px 5px rgba(0, 0, 0, 0.5),
        inset 0 2px 0 rgba(255, 255, 255, 0.15),
        inset 2px 0 0 rgba(255, 255, 255, 0.08),
        inset -2px 0 0 rgba(0, 0, 0, 0.15),
        inset 0 -2px 0 rgba(0, 0, 0, 0.25);
}

button:active {
    transform: translateY(3px);
    background: #2a2520;
    box-shadow:
        0 1px 0 #1a1815,
        0 2px 2px rgba(0, 0, 0, 0.3),
        inset 0 2px 3px rgba(0, 0, 0, 0.2),
        inset 2px 0 0 rgba(0, 0, 0, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 -1px 0 rgba(255, 255, 255, 0.05);
}

/* Math notation styling */
.math {
    font-family: 'Times New Roman', 'Fraunces', serif;
    font-weight: 500;
    font-style: italic;
}

button sup, button sub {
    font-size: 0.7em;
}

/* Number keys - White/cream colored like vintage HP */
button[data-action="0"],
button[data-action="1"],
button[data-action="2"],
button[data-action="3"],
button[data-action="4"],
button[data-action="5"],
button[data-action="6"],
button[data-action="7"],
button[data-action="8"],
button[data-action="9"],
button[data-action="."] {
    background: #484440;
    color: #ffffff;
    font-weight: 700;
    font-size: 16px;
    box-shadow:
        0 4px 0 #1a1815,
        0 5px 3px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 rgba(255, 255, 255, 0.15),
        inset 2px 0 0 rgba(255, 255, 255, 0.08),
        inset -2px 0 0 rgba(0, 0, 0, 0.12),
        inset 0 -2px 0 rgba(0, 0, 0, 0.2);
}

button[data-action="0"]:hover,
button[data-action="1"]:hover,
button[data-action="2"]:hover,
button[data-action="3"]:hover,
button[data-action="4"]:hover,
button[data-action="5"]:hover,
button[data-action="6"]:hover,
button[data-action="7"]:hover,
button[data-action="8"]:hover,
button[data-action="9"]:hover,
button[data-action="."]:hover {
    background: #555048;
}

/* Operation buttons - Gold/Brown HP style */
.opBtn {
    background: #5a4820;
    color: #fff8e0;
    font-weight: 700;
    font-size: 18px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    box-shadow:
        0 4px 0 #3a3018,
        0 5px 3px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 rgba(255, 230, 180, 0.2),
        inset 2px 0 0 rgba(255, 230, 180, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.2),
        inset 0 -2px 0 rgba(0, 0, 0, 0.3);
}

.opBtn:hover {
    background: #6a5830;
}

.opBtn:active {
    background: #4a3818;
    box-shadow:
        0 1px 0 #3a3018,
        0 2px 2px rgba(0, 0, 0, 0.3),
        inset 0 2px 3px rgba(0, 0, 0, 0.2),
        inset 2px 0 0 rgba(0, 0, 0, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 -1px 0 rgba(255, 230, 180, 0.05);
}

/* Function buttons - Olive/Khaki HP style */
.fnBtn {
    background: #4a4220;
    color: #e8e080;
    font-weight: 600;
    font-size: 12px;
    box-shadow:
        0 4px 0 #282418,
        0 5px 3px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 rgba(220, 220, 140, 0.15),
        inset 2px 0 0 rgba(220, 220, 140, 0.08),
        inset -2px 0 0 rgba(0, 0, 0, 0.18),
        inset 0 -2px 0 rgba(0, 0, 0, 0.28);
}

.fnBtn:hover {
    background: #5a5230;
}

.fnBtn:active {
    background: #3a3418;
    box-shadow:
        0 1px 0 #282418,
        0 2px 2px rgba(0, 0, 0, 0.3),
        inset 0 2px 3px rgba(0, 0, 0, 0.2),
        inset 2px 0 0 rgba(0, 0, 0, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 -1px 0 rgba(220, 220, 140, 0.05);
}

/* Memory buttons - Blue HP style */
.memBtn {
    background: #283850;
    color: #90d0ff;
    font-weight: 600;
    font-size: 12px;
    box-shadow:
        0 4px 0 #152030,
        0 5px 3px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 rgba(140, 190, 255, 0.15),
        inset 2px 0 0 rgba(140, 190, 255, 0.08),
        inset -2px 0 0 rgba(0, 0, 0, 0.2),
        inset 0 -2px 0 rgba(0, 0, 0, 0.3);
}

.memBtn:hover {
    background: #384860;
}

.memBtn:active {
    background: #1a2840;
    box-shadow:
        0 1px 0 #152030,
        0 2px 2px rgba(0, 0, 0, 0.3),
        inset 0 2px 3px rgba(0, 0, 0, 0.2),
        inset 2px 0 0 rgba(0, 0, 0, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 -1px 0 rgba(140, 190, 255, 0.05);
}

/* Other/Stack operation buttons - Tan/Brown */
.otherBtn {
    background: #443020;
    color: #ffcc88;
    font-weight: 600;
    font-size: 11px;
    box-shadow:
        0 4px 0 #201810,
        0 5px 3px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 rgba(255, 200, 150, 0.15),
        inset 2px 0 0 rgba(255, 200, 150, 0.08),
        inset -2px 0 0 rgba(0, 0, 0, 0.18),
        inset 0 -2px 0 rgba(0, 0, 0, 0.28);
}

.otherBtn:hover {
    background: #544030;
}

.otherBtn:active {
    background: #342418;
    box-shadow:
        0 1px 0 #201810,
        0 2px 2px rgba(0, 0, 0, 0.3),
        inset 0 2px 3px rgba(0, 0, 0, 0.2),
        inset 2px 0 0 rgba(0, 0, 0, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 -1px 0 rgba(255, 200, 150, 0.05);
}

/* ENTER button - Special gold highlight, double-width */
.enter-btn {
    grid-column: span 2;
    background: #5a4820;
    color: #ffe8a0;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.5px;
    box-shadow:
        0 4px 0 #3a3018,
        0 5px 3px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 rgba(255, 220, 160, 0.2),
        inset 2px 0 0 rgba(255, 220, 160, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.2),
        inset 0 -2px 0 rgba(0, 0, 0, 0.3);
}

.enter-btn:hover {
    background: #6a5830;
}

.enter-btn:active {
    background: #4a3818;
    box-shadow:
        0 1px 0 #3a3018,
        0 2px 2px rgba(0, 0, 0, 0.3),
        inset 0 2px 3px rgba(0, 0, 0, 0.2),
        inset 2px 0 0 rgba(0, 0, 0, 0.1),
        inset -2px 0 0 rgba(0, 0, 0, 0.1),
        inset 0 -1px 0 rgba(255, 220, 160, 0.05);
}

/* Wide button styling */
.wide-btn {
    grid-column: span 1;
}

/* Clear button - Red accent */
button[data-action="CLR"] {
    color: #ff9080;
}

/* Responsive Design */
@media (max-width: 480px) {
    body {
        padding: 15px 10px;
    }

    #calculator-body {
        max-width: 100%;
        border-radius: 12px 12px 16px 16px;
    }

    #hp-header {
        padding: 14px 18px 10px 18px;
    }

    .hp-letters {
        font-size: 24px;
    }

    .model-name {
        font-size: 20px;
    }

    .model-type {
        font-size: 8px;
    }

    #display-bezel {
        margin: 12px 14px;
    }

    #keyboard-section {
        padding: 0 14px 16px 14px;
    }

    button {
        font-size: 10px;
        height: 38px;
    }

    button[data-action="0"],
    button[data-action="1"],
    button[data-action="2"],
    button[data-action="3"],
    button[data-action="4"],
    button[data-action="5"],
    button[data-action="6"],
    button[data-action="7"],
    button[data-action="8"],
    button[data-action="9"],
    button[data-action="."] {
        font-size: 13px;
    }

    .opBtn {
        font-size: 14px;
    }

    .stack-value {
        font-size: 14px;
    }

    .stack-label {
        font-size: 11px;
    }
}

@media (max-width: 360px) {
    #hp-header {
        padding: 12px 14px 8px 14px;
    }

    .hp-letters {
        font-size: 20px;
    }

    .model-name {
        font-size: 16px;
    }

    button {
        font-size: 9px;
        height: 34px;
    }

    .button-row {
        gap: 3px;
    }

    #calcContainer {
        gap: 4px;
    }
}